staging: vpfe_mc_capture: Clean up tests if NULL returned on failure

Some functions like kmalloc/kzalloc return NULL on failure.
When NULL represents failure, !x is commonly used.

This was done using Coccinelle:
@@
expression *e;
identifier l1;
@@

e = \(kmalloc\|kzalloc\|kcalloc\|devm_kzalloc\)(...);
...
- e == NULL
+ !e
Signed-off-by: simran singhal <singhalsimran0@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/media/davinci_vpfe/vpfe_mc_capture.c

@@ -228,7 +228,7 @@ static int vpfe_enable_clock(struct vpfe_device *vpfe_dev)
 
 	vpfe_dev->clks = kcalloc(vpfe_cfg->num_clocks,
 				 sizeof(*vpfe_dev->clks), GFP_KERNEL);
-	if (vpfe_dev->clks == NULL)
+	if (!vpfe_dev->clks)
 		return -ENOMEM;
 
 	for (i = 0; i < vpfe_cfg->num_clocks; i++) {
@@ -348,7 +348,7 @@ static int register_i2c_devices(struct vpfe_device *vpfe_dev)
 	vpfe_dev->sd =
 		  kcalloc(num_subdevs, sizeof(struct v4l2_subdev *),
 			  GFP_KERNEL);
-	if (vpfe_dev->sd == NULL)
+	if (!vpfe_dev->sd)
 		return -ENOMEM;
 
 	for (i = 0, k = 0; i < num_subdevs; i++) {