ALSA: Add missing .owner=THIS_MODULE to platform_driver definitions

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/ppc/powermac.c b/sound/ppc/powermac.c
index 5a4e263..aef54be 100644
--- a/sound/ppc/powermac.c
+++ b/sound/ppc/powermac.c
@@ -169,7 +169,8 @@
 	.resume		= snd_pmac_driver_resume,
 #endif
 	.driver		= {
-		.name	= SND_PMAC_DRIVER
+		.name	= SND_PMAC_DRIVER,
+		.owner	= THIS_MODULE,
 	},
 };