[ALSA] make sound/pci/hda/patch_sigmatel.c:stac92xx_dmic_labels[] static

This patch makes the needlessly global stac92xx_dmic_labels[] static.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/pci/hda/patch_sigmatel.c

@@ -1201,7 +1201,7 @@ static int stac92xx_auto_create_hp_ctls(struct hda_codec *codec,
 }
 
 /* labels for dmic mux inputs */
-const char *stac92xx_dmic_labels[5] = {
+static const char *stac92xx_dmic_labels[5] = {
 	"Analog Inputs", "Digital Mic 1", "Digital Mic 2",
 	"Digital Mic 3", "Digital Mic 4"
 };