ALSA: rme9652: fix a missing comma in channel_map_9636_ds[]

The lack of comma leads to the wrong channel for an SPDIF channel.
Unfortunately this wasn't caught by compiler because it's still a
valid expression.
Reported-by: NAlexander Aristov <aristov.alexander@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/rme9652/rme9652.c

@@ -285,7 +285,7 @@ static char channel_map_9636_ds[26] = {
 	/* ADAT channels are remapped */
 	1, 3, 5, 7, 9, 11, 13, 15,
 	/* channels 8 and 9 are S/PDIF */
-	24, 25
+	24, 25,
 	/* others don't exist */
 	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
 };