ALSA: Add missing .owner=THIS_MODULE to platform_driver definitions

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/mpu401/mpu401.c

@@ -139,7 +139,8 @@ static struct platform_driver snd_mpu401_driver = {
 	.probe		= snd_mpu401_probe,
 	.remove		= __devexit_p(snd_mpu401_remove),
 	.driver		= {
-		.name	= SND_MPU401_DRIVER
+		.name	= SND_MPU401_DRIVER,
+		.owner	= THIS_MODULE,
 	},
 };