ALSA: hda - Fix no NID error with VIA codecs

The via driver spews warnigs like
	hda-codec: no NID for mapping control Independent HP:0:0
with some codecs because snd_hda_add_nid() is called with nid=0.
This patch fixes it by skipping the call when no corresponding widget
is found.

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

1 files changed, 7 insertions, 4 deletions

diff --git a/sound/pci/hda/patch_via.c b/sound/pci/hda/patch_via.c
index 605c99e1e520..c952582fb218 100644
--- a/sound/pci/hda/patch_via.c
+++ b/sound/pci/hda/patch_via.c
@@ -832,10 +832,13 @@ static int via_hp_build(struct hda_codec *codec)
         knew->subdevice = HDA_SUBDEV_NID_FLAG | nid;
         knew->private_value = nid;
 
-        knew = via_clone_control(spec, &via_hp_mixer[1]);
-        if (knew == NULL)
-                return -ENOMEM;
-        knew->subdevice = side_mute_channel(spec);
+        nid = side_mute_channel(spec);
+        if (nid) {
+                knew = via_clone_control(spec, &via_hp_mixer[1]);
+                if (knew == NULL)
+                        return -ENOMEM;
+                knew->subdevice = nid;
+        }
 
         return 0;
 }