[media] lirc_zilog: Fix NULL comparisons style

Fix all checkpatch reported issues for "CHECK: Comparison to NULL could
be written...".

Do these comparisons using the recommended coding style and consistent
with other similar cases in the file, which already used the recommended
way.
Signed-off-by: Ricardo Silva <rjpdasilva@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/lirc/lirc_zilog.c

@@ -215,7 +215,7 @@ static struct IR_rx *get_ir_rx(struct IR *ir)
 
 	spin_lock(&ir->rx_ref_lock);
 	rx = ir->rx;
-	if (rx != NULL)
+	if (rx)
 		kref_get(&rx->ref);
 	spin_unlock(&ir->rx_ref_lock);
 	return rx;
@@ -277,7 +277,7 @@ static struct IR_tx *get_ir_tx(struct IR *ir)
 
 	spin_lock(&ir->tx_ref_lock);
 	tx = ir->tx;
-	if (tx != NULL)
+	if (tx)
 		kref_get(&tx->ref);
 	spin_unlock(&ir->tx_ref_lock);
 	return tx;
@@ -327,12 +327,12 @@ static int add_to_buf(struct IR *ir)
 	}
 
 	rx = get_ir_rx(ir);
-	if (rx == NULL)
+	if (!rx)
 		return -ENXIO;
 
 	/* Ensure our rx->c i2c_client remains valid for the duration */
 	mutex_lock(&rx->client_lock);
-	if (rx->c == NULL) {
+	if (!rx->c) {
 		mutex_unlock(&rx->client_lock);
 		put_ir_rx(rx, false);
 		return -ENXIO;
@@ -388,7 +388,7 @@ static int add_to_buf(struct IR *ir)
 				break;
 			}
 			schedule_timeout((100 * HZ + 999) / 1000);
-			if (tx != NULL)
+			if (tx)
 				tx->need_boot = 1;
 
 			++failures;
@@ -444,7 +444,7 @@ static int add_to_buf(struct IR *ir)
 	} while (!lirc_buffer_full(rbuf));
 
 	mutex_unlock(&rx->client_lock);
-	if (tx != NULL)
+	if (tx)
 		put_ir_tx(tx, false);
 	put_ir_rx(rx, false);
 	return ret;
@@ -763,7 +763,7 @@ static int fw_load(struct IR_tx *tx)
 
 	/* Parse the file */
 	tx_data = vmalloc(sizeof(*tx_data));
-	if (tx_data == NULL) {
+	if (!tx_data) {
 		release_firmware(fw_entry);
 		ret = -ENOMEM;
 		goto out;
@@ -772,7 +772,7 @@ static int fw_load(struct IR_tx *tx)
 
 	/* Copy the data so hotplug doesn't get confused and timeout */
 	tx_data->datap = vmalloc(fw_entry->size);
-	if (tx_data->datap == NULL) {
+	if (!tx_data->datap) {
 		release_firmware(fw_entry);
 		vfree(tx_data);
 		ret = -ENOMEM;
@@ -809,7 +809,7 @@ static int fw_load(struct IR_tx *tx)
 
 	tx_data->code_sets = vmalloc(
 		tx_data->num_code_sets * sizeof(char *));
-	if (tx_data->code_sets == NULL) {
+	if (!tx_data->code_sets) {
 		fw_unload_locked();
 		ret = -ENOMEM;
 		goto out;
@@ -896,7 +896,7 @@ static ssize_t read(struct file *filep, char __user *outbuf, size_t n,
 	}
 
 	rx = get_ir_rx(ir);
-	if (rx == NULL)
+	if (!rx)
 		return -ENXIO;
 
 	/*
@@ -1102,12 +1102,12 @@ static ssize_t write(struct file *filep, const char __user *buf, size_t n,
 
 	/* Get a struct IR_tx reference */
 	tx = get_ir_tx(ir);
-	if (tx == NULL)
+	if (!tx)
 		return -ENXIO;
 
 	/* Ensure our tx->c i2c_client remains valid for the duration */
 	mutex_lock(&tx->client_lock);
-	if (tx->c == NULL) {
+	if (!tx->c) {
 		mutex_unlock(&tx->client_lock);
 		put_ir_tx(tx, false);
 		return -ENXIO;
@@ -1206,7 +1206,7 @@ static unsigned int poll(struct file *filep, poll_table *wait)
 	dev_dbg(ir->l.dev, "poll called\n");
 
 	rx = get_ir_rx(ir);
-	if (rx == NULL) {
+	if (!rx) {
 		/*
 		 * Revisit this, if our poll function ever reports writeable
 		 * status for Tx
@@ -1313,7 +1313,7 @@ static int open(struct inode *node, struct file *filep)
 	/* find our IR struct */
 	ir = get_ir_device_by_minor(minor);
 
-	if (ir == NULL)
+	if (!ir)
 		return -ENODEV;
 
 	atomic_inc(&ir->open_count);
@@ -1331,7 +1331,7 @@ static int close(struct inode *node, struct file *filep)
 	/* find our IR struct */
 	struct IR *ir = filep->private_data;
 
-	if (ir == NULL) {
+	if (!ir) {
 		pr_err("ir: close: no private_data attached to the file!\n");
 		return -ENODEV;
 	}
@@ -1395,7 +1395,7 @@ static int ir_remove(struct i2c_client *client)
 	if (strncmp("ir_tx_z8", client->name, 8) == 0) {
 		struct IR_tx *tx = i2c_get_clientdata(client);
 
-		if (tx != NULL) {
+		if (tx) {
 			mutex_lock(&tx->client_lock);
 			tx->c = NULL;
 			mutex_unlock(&tx->client_lock);
@@ -1404,7 +1404,7 @@ static int ir_remove(struct i2c_client *client)
 	} else if (strncmp("ir_rx_z8", client->name, 8) == 0) {
 		struct IR_rx *rx = i2c_get_clientdata(client);
 
-		if (rx != NULL) {
+		if (rx) {
 			mutex_lock(&rx->client_lock);
 			rx->c = NULL;
 			mutex_unlock(&rx->client_lock);
@@ -1460,7 +1460,7 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 	/* Use a single struct IR instance for both the Rx and Tx functions */
 	ir = get_ir_device_by_adapter(adap);
-	if (ir == NULL) {
+	if (!ir) {
 		ir = kzalloc(sizeof(struct IR), GFP_KERNEL);
 		if (!ir) {
 			ret = -ENOMEM;
@@ -1534,7 +1534,7 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		fw_load(tx);
 
 		/* Proceed only if the Rx client is also ready or not needed */
-		if (rx == NULL && !tx_only) {
+		if (!rx && !tx_only) {
 			dev_info(tx->ir->l.dev,
 				 "probe of IR Tx on %s (i2c-%d) done. Waiting on IR Rx.\n",
 				 adap->name, adap->nr);
@@ -1588,7 +1588,7 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		}
 
 		/* Proceed only if the Tx client is also ready */
-		if (tx == NULL) {
+		if (!tx) {
 			pr_info("probe of IR Rx on %s (i2c-%d) done. Waiting on IR Tx.\n",
 				adap->name, adap->nr);
 			goto out_ok;
@@ -1609,9 +1609,9 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		 adap->name, adap->nr, ir->l.minor);
 
 out_ok:
-	if (rx != NULL)
+	if (rx)
 		put_ir_rx(rx, true);
-	if (tx != NULL)
+	if (tx)
 		put_ir_tx(tx, true);
 	put_ir_device(ir, true);
 	dev_info(ir->l.dev,
@@ -1621,10 +1621,10 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	return 0;
 
 out_put_xx:
-	if (rx != NULL)
+	if (rx)
 		put_ir_rx(rx, true);
 out_put_tx:
-	if (tx != NULL)
+	if (tx)
 		put_ir_tx(tx, true);
 out_put_ir:
 	put_ir_device(ir, true);