[ALSA] unregister platform device again if probe was unsuccessful

This second one unregisters the platform device again when the probe is
unsuccesful for sound/drivers, sound/arm/sa11xx-uda1341.c and
sound/ppc/powermac.c. This gets them all.

Signed-off-by: Rene Herman <rene.herman@keyaccess.nl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/virmidi.c

@@ -171,6 +171,10 @@ static int __init alsa_card_virmidi_init(void)
 							 i, NULL, 0);
 		if (IS_ERR(device))
 			continue;
+		if (!platform_get_drvdata(device)) {
+			platform_device_unregister(device);
+			continue;
+		}
 		devices[i] = device;
 		cards++;
 	}