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ALSA: mpu401: Adjust four checks for null pointers 

The script “checkpatch.pl” pointed information out like the following.

Comparison to NULL could be written !…

Thus fix the affected source code places.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Markus Elfring 2017-08-12 20:50:16 +02:00 committed by Takashi Iwai
parent ec1f43c83b
commit f1a77dc171
1 changed files with 4 additions and 4 deletions
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8
sound/drivers/mpu401/mpu401_uart.c
View File

@ -136,7 +136,7 @@ irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
{
struct snd_mpu401 *mpu = dev_id;
if (mpu == NULL)
if (!mpu)
return IRQ_NONE;
_snd_mpu401_uart_interrupt(mpu);
return IRQ_HANDLED;
@ -157,7 +157,7 @@ irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
{
struct snd_mpu401 *mpu = dev_id;
if (mpu == NULL)
if (!mpu)
return IRQ_NONE;
uart_interrupt_tx(mpu);
return IRQ_HANDLED;
@ -544,7 +544,7 @@ int snd_mpu401_uart_new(struct snd_card *card, int device,
out_enable, in_enable, &rmidi)) < 0)
return err;
mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
if (mpu == NULL) {
if (!mpu) {
err = -ENOMEM;
goto free_device;
}
@ -558,7 +558,7 @@ int snd_mpu401_uart_new(struct snd_card *card, int device,
if (! (info_flags & MPU401_INFO_INTEGRATED)) {
int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
mpu->res = request_region(port, res_size, "MPU401 UART");
if (mpu->res == NULL) {
if (!mpu->res) {
snd_printk(KERN_ERR "mpu401_uart: "
"unable to grab port 0x%lx size %d\n",
port, res_size);