ALSA: hda - Don't set invalid connection index in Realtek initialiaiton

Skip initialization of connections of DAC widgets that aren't used,
which resulted in invalid verb parameters.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_realtek.c

@@ -10043,8 +10043,11 @@ static void alc882_auto_set_output_and_unmute(struct hda_codec *codec,
 	alc_set_pin_output(codec, nid, pin_type);
 	if (spec->multiout.dac_nids[dac_idx] == 0x25)
 		idx = 4;
-	else
+	else {
+		if (spec->multiout.num_dacs >= dac_idx)
+			return;
 		idx = spec->multiout.dac_nids[dac_idx] - 2;
+	}
 	snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_CONNECT_SEL, idx);
 
 }