ALSA: HDA VIA: Modify vt1708_auto_create_multi_out_ctls.

Rewrite nid_vol/mute assignment for clearity, and check line connection
before adding control for it.

Signed-off-by: Lydia Wang <lydiawang@viatech.com.cn>
Signed-off-by: Logan Li <loganli@viatech.com.cn>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_via.c

@@ -1553,7 +1553,7 @@ static int vt1708_auto_create_multi_out_ctls(struct via_spec *spec,
 {
 	char name[32];
 	static const char *chname[4] = { "Front", "Surround", "C/LFE", "Side" };
-	hda_nid_t nid, nid_vol = 0;
+	hda_nid_t nid, nid_vol, nid_vols[] = {0x17, 0x19, 0x1a, 0x1b};
 	int i, err;
 
 	for (i = 0; i <= AUTO_SEQ_SIDE; i++) {
@@ -1562,8 +1562,7 @@ static int vt1708_auto_create_multi_out_ctls(struct via_spec *spec,
 		if (!nid)
 			continue;
 		
-		if (i != AUTO_SEQ_FRONT)
-			nid_vol = 0x18 + i;
+		nid_vol = nid_vols[i];
 
 		if (i == AUTO_SEQ_CENLFE) {
 			/* Center/LFE */
@@ -1595,13 +1594,13 @@ static int vt1708_auto_create_multi_out_ctls(struct via_spec *spec,
 			/* add control to mixer index 0 */
 			err = via_add_control(spec, VIA_CTL_WIDGET_VOL,
 					      "Master Front Playback Volume",
-					      HDA_COMPOSE_AMP_VAL(0x17, 3, 0,
+					      HDA_COMPOSE_AMP_VAL(nid_vol, 3, 0,
 								  HDA_INPUT));
 			if (err < 0)
 				return err;
 			err = via_add_control(spec, VIA_CTL_WIDGET_MUTE,
 					      "Master Front Playback Switch",
-					      HDA_COMPOSE_AMP_VAL(0x17, 3, 0,
+					      HDA_COMPOSE_AMP_VAL(nid_vol, 3, 0,
 								  HDA_INPUT));
 			if (err < 0)
 				return err;