ALSA: Add missing .owner=THIS_MODULE to platform_driver definitions

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/drivers/serial-u16550.c b/sound/drivers/serial-u16550.c
index b2d0e8e..8670067 100644
--- a/sound/drivers/serial-u16550.c
+++ b/sound/drivers/serial-u16550.c
@@ -995,7 +995,8 @@
 	.probe		= snd_serial_probe,
 	.remove		= __devexit_p( snd_serial_remove),
 	.driver		= {
-		.name	= SND_SERIAL_DRIVER
+		.name	= SND_SERIAL_DRIVER,
+		.owner	= THIS_MODULE,
 	},
 };