media: staging: atomisp2: cleanup null check on memory allocation

For memory allocation functions that fail with a NULL return value, it
is preferred to use the (!x) test in place of (x == NULL).

Changes in atomisp2/css2400/sh_css.c were done by hand.

Done with the help of the following cocci script:

@@
type T;
T* p;
statement s,s1;
@@

p =
  \(devm_kzalloc\|devm_ioremap\|usb_alloc_urb\|alloc_netdev\|dev_alloc_skb\|
   kmalloc\|kmalloc_array\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
   kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|devm_kzalloc\)(...)
...when != p

if (
- p == NULL
+ !p
 ) s
 else s1

--
Changes in v3:
  Rebase changes over atomisp-next branch of the media tree
Changes in atomisp2/css2400/sh_css.c were done by hand, the above script
was not able to match the pattern if (a->b != null).
Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css.c

@@ -5605,13 +5605,13 @@ static enum ia_css_err load_video_binaries(struct ia_css_pipe *pipe)
 		mycs->num_yuv_scaler = cas_scaler_descr.num_stage;
 		mycs->yuv_scaler_binary = kzalloc(cas_scaler_descr.num_stage *
 			sizeof(struct ia_css_binary), GFP_KERNEL);
-		if (mycs->yuv_scaler_binary == NULL) {
+		if (!mycs->yuv_scaler_binary) {
 			err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 			return err;
 		}
 		mycs->is_output_stage = kzalloc(cas_scaler_descr.num_stage
 					* sizeof(bool), GFP_KERNEL);
-		if (mycs->is_output_stage == NULL) {
+		if (!mycs->is_output_stage) {
 			err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 			return err;
 		}
@@ -6256,14 +6256,14 @@ static enum ia_css_err load_primary_binaries(
 		mycs->num_yuv_scaler = cas_scaler_descr.num_stage;
 		mycs->yuv_scaler_binary = kzalloc(cas_scaler_descr.num_stage *
 			sizeof(struct ia_css_binary), GFP_KERNEL);
-		if (mycs->yuv_scaler_binary == NULL) {
+		if (!mycs->yuv_scaler_binary) {
 			err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 			IA_CSS_LEAVE_ERR_PRIVATE(err);
 			return err;
 		}
 		mycs->is_output_stage = kzalloc(cas_scaler_descr.num_stage *
 			sizeof(bool), GFP_KERNEL);
-		if (mycs->is_output_stage == NULL) {
+		if (!mycs->is_output_stage) {
 			err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 			IA_CSS_LEAVE_ERR_PRIVATE(err);
 			return err;
@@ -6980,27 +6980,27 @@ static enum ia_css_err ia_css_pipe_create_cas_scaler_desc_single_output(
 	}
 
 	descr->in_info = kmalloc(descr->num_stage * sizeof(struct ia_css_frame_info), GFP_KERNEL);
-	if (descr->in_info == NULL) {
+	if (!descr->in_info) {
 		err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 		goto ERR;
 	}
 	descr->internal_out_info = kmalloc(descr->num_stage * sizeof(struct ia_css_frame_info), GFP_KERNEL);
-	if (descr->internal_out_info == NULL) {
+	if (!descr->internal_out_info) {
 		err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 		goto ERR;
 	}
 	descr->out_info = kmalloc(descr->num_stage * sizeof(struct ia_css_frame_info), GFP_KERNEL);
-	if (descr->out_info == NULL) {
+	if (!descr->out_info) {
 		err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 		goto ERR;
 	}
 	descr->vf_info = kmalloc(descr->num_stage * sizeof(struct ia_css_frame_info), GFP_KERNEL);
-	if (descr->vf_info == NULL) {
+	if (!descr->vf_info) {
 		err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 		goto ERR;
 	}
 	descr->is_output_stage = kmalloc(descr->num_stage * sizeof(bool), GFP_KERNEL);
-	if (descr->is_output_stage == NULL) {
+	if (!descr->is_output_stage) {
 		err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 		goto ERR;
 	}
@@ -7116,22 +7116,22 @@ static enum ia_css_err ia_css_pipe_create_cas_scaler_desc(struct ia_css_pipe *pi
 	descr->num_stage = num_stages;
 
 	descr->in_info = kmalloc(descr->num_stage * sizeof(struct ia_css_frame_info), GFP_KERNEL);
-	if (descr->in_info == NULL) {
+	if (!descr->in_info) {
 		err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 		goto ERR;
 	}
 	descr->internal_out_info = kmalloc(descr->num_stage * sizeof(struct ia_css_frame_info), GFP_KERNEL);
-	if (descr->internal_out_info == NULL) {
+	if (!descr->internal_out_info) {
 		err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 		goto ERR;
 	}
 	descr->out_info = kmalloc(descr->num_stage * sizeof(struct ia_css_frame_info), GFP_KERNEL);
-	if (descr->out_info == NULL) {
+	if (!descr->out_info) {
 		err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 		goto ERR;
 	}
 	descr->vf_info = kmalloc(descr->num_stage * sizeof(struct ia_css_frame_info), GFP_KERNEL);
-	if (descr->vf_info == NULL) {
+	if (!descr->vf_info) {
 		err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 		goto ERR;
 	}
@@ -7274,13 +7274,13 @@ load_yuvpp_binaries(struct ia_css_pipe *pipe)
 		mycs->num_yuv_scaler = cas_scaler_descr.num_stage;
 		mycs->yuv_scaler_binary = kzalloc(cas_scaler_descr.num_stage *
 			sizeof(struct ia_css_binary), GFP_KERNEL);
-		if (mycs->yuv_scaler_binary == NULL) {
+		if (!mycs->yuv_scaler_binary) {
 			err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 			goto ERR;
 		}
 		mycs->is_output_stage = kzalloc(cas_scaler_descr.num_stage *
 			sizeof(bool), GFP_KERNEL);
-		if (mycs->is_output_stage == NULL) {
+		if (!mycs->is_output_stage) {
 			err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 			goto ERR;
 		}
@@ -7381,7 +7381,7 @@ load_yuvpp_binaries(struct ia_css_pipe *pipe)
 	}
 	mycs->vf_pp_binary = kzalloc(mycs->num_vf_pp * sizeof(struct ia_css_binary),
 						GFP_KERNEL);
-	if (mycs->vf_pp_binary == NULL) {
+	if (!mycs->vf_pp_binary) {
 		err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 		goto ERR;
 	}
@@ -9443,7 +9443,7 @@ ia_css_stream_create(const struct ia_css_stream_config *stream_config,
 
 	/* allocate the stream instance */
 	curr_stream = kmalloc(sizeof(struct ia_css_stream), GFP_KERNEL);
-	if (curr_stream == NULL) {
+	if (!curr_stream) {
 		err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 		IA_CSS_LEAVE_ERR(err);
 		return err;
@@ -9455,7 +9455,7 @@ ia_css_stream_create(const struct ia_css_stream_config *stream_config,
 	/* allocate pipes */
 	curr_stream->num_pipes = num_pipes;
 	curr_stream->pipes = kzalloc(num_pipes * sizeof(struct ia_css_pipe *), GFP_KERNEL);
-	if (curr_stream->pipes == NULL) {
+	if (!curr_stream->pipes) {
 		curr_stream->num_pipes = 0;
 		kfree(curr_stream);
 		curr_stream = NULL;

drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_firmware.c

@@ -147,7 +147,7 @@ sh_css_load_blob_info(const char *fw, const struct ia_css_fw_info *bi, struct ia
 
 		char *parambuf = kmalloc(paramstruct_size + configstruct_size + statestruct_size,
 							GFP_KERNEL);
-		if (parambuf == NULL)
+		if (!parambuf)
 			return IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 
 		bd->mem_offsets.array[IA_CSS_PARAM_CLASS_PARAM].ptr = NULL;
@@ -229,7 +229,7 @@ sh_css_load_firmware(const char *fw_data,
 		sh_css_blob_info = kmalloc(
 					(sh_css_num_binaries - NUM_OF_SPS) *
 					sizeof(*sh_css_blob_info), GFP_KERNEL);
-		if (sh_css_blob_info == NULL)
+		if (!sh_css_blob_info)
 			return IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 	} else {
 		sh_css_blob_info = NULL;
@@ -237,8 +237,7 @@ sh_css_load_firmware(const char *fw_data,
 
 	fw_minibuffer = kcalloc(sh_css_num_binaries, sizeof(struct fw_param),
 				GFP_KERNEL);
-
-	if (fw_minibuffer == NULL)
+	if (!fw_minibuffer)
 		return IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
 
 	for (i = 0; i < sh_css_num_binaries; i++) {

drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_param_shading.c

@@ -365,7 +365,7 @@ ia_css_shading_table_alloc(
 	IA_CSS_ENTER("");
 
 	me = kmalloc(sizeof(*me), GFP_KERNEL);
-	if (me == NULL) {
+	if (!me) {
 		IA_CSS_ERROR("out of memory");
 		return me;
 	}