ALSA: hda - simplify usage of HDA_SUBDEV_AMP_FLAG

The HDA_SUBDEV_NID_FLAG is duplicate for amplifier control elements. Move
get_amp_nid_() call to the snd_hda_ctl_add() function.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 1ee586b..0bafea9 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -2685,7 +2685,7 @@
 stac_control_new(struct sigmatel_spec *spec,
 		 struct snd_kcontrol_new *ktemp,
 		 const char *name,
-		 hda_nid_t nid)
+		 unsigned int subdev)
 {
 	struct snd_kcontrol_new *knew;
 
@@ -2701,9 +2701,7 @@
 		spec->kctls.alloced--;
 		return NULL;
 	}
-	if (nid)
-		knew->subdevice = HDA_SUBDEV_NID_FLAG |
-				  HDA_SUBDEV_AMP_FLAG | nid;
+	knew->subdevice = subdev;
 	return knew;
 }
 
@@ -2713,7 +2711,7 @@
 				     unsigned long val)
 {
 	struct snd_kcontrol_new *knew = stac_control_new(spec, ktemp, name,
-							 get_amp_nid_(val));
+							 HDA_SUBDEV_AMP_FLAG);
 	if (!knew)
 		return -ENOMEM;
 	knew->index = idx;