[ALSA] Fix check of enable module option

Fix the check of enable module option in probe of platform_device drivers.
It shouldn't break the loop but just ignore if enable[i] is false.

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

sound/drivers/serial-u16550.c

@@ -989,8 +989,10 @@ static int __init alsa_card_serial_init(void)
 		return err;
 
 	cards = 0;
-	for (i = 0; i < SNDRV_CARDS && enable[i]; i++) {
+	for (i = 0; i < SNDRV_CARDS; i++) {
 		struct platform_device *device;
+		if (! enable[i])
+			continue;
 		device = platform_device_register_simple(SND_SERIAL_DRIVER,
 							 i, NULL, 0);
 		if (IS_ERR(device)) {