[ALSA] ac97 - fix Mic jack sharing on AD1888 codecs

AC97 Codec
The code for modifying the center/LFE disable bit on AD1888 codecs
accidentally toggled the mute split bit instead.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

sound/pci/ac97/ac97_patch.c

@@ -1507,7 +1507,7 @@ static void ad1888_update_jacks(ac97_t *ac97)
 			     is_shared_linein(ac97) ? 0 : 1 << 12);
 	/* shared Mic */
 	snd_ac97_update_bits(ac97, AC97_AD_MISC, 1 << 11,
-			     is_shared_micin(ac97) ? 0 : 1 << 13);
+			     is_shared_micin(ac97) ? 0 : 1 << 11);
 }
 
 static const snd_kcontrol_new_t snd_ac97_ad1888_controls[] = {