ALSA: msnd: Use snd_ctl_enum_info()

... and reduce the open codes.  Also add missing const to the text array.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/msnd/msnd_pinnacle_mixer.c

@@ -55,20 +55,13 @@
 static int snd_msndmix_info_mux(struct snd_kcontrol *kcontrol,
 				struct snd_ctl_elem_info *uinfo)
 {
-	static char *texts[3] = {
+	static const char * const texts[3] = {
 		"Analog", "MASS", "SPDIF",
 	};
 	struct snd_msnd *chip = snd_kcontrol_chip(kcontrol);
 	unsigned items = test_bit(F_HAVEDIGITAL, &chip->flags) ? 3 : 2;
 
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
-	uinfo->count = 1;
-	uinfo->value.enumerated.items = items;
-	if (uinfo->value.enumerated.item >= items)
-		uinfo->value.enumerated.item = items - 1;
-	strcpy(uinfo->value.enumerated.name,
-		texts[uinfo->value.enumerated.item]);
-	return 0;
+	return snd_ctl_enum_info(uinfo, 1, items, texts);
 }
 
 static int snd_msndmix_get_mux(struct snd_kcontrol *kcontrol,