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>

diff --git a/sound/drivers/mpu401/mpu401_uart.c b/sound/drivers/mpu401/mpu401_uart.c
index e8bdea193eab19285092b7cd021935092bd01290..b997222274bd96c4ea88aa0fc83cd6b2cc8567f7 100644 (file)
--- a/sound/drivers/mpu401/mpu401_uart.c
+++ b/sound/drivers/mpu401/mpu401_uart.c
@@ -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);