ALSA: bt87x: use enum control info helper

Simplify the info callback by using the snd_ctl_enum_info() helper function.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/bt87x.c

@@ -637,15 +637,9 @@ static struct snd_kcontrol_new snd_bt87x_capture_boost = {
 static int snd_bt87x_capture_source_info(struct snd_kcontrol *kcontrol,
 					 struct snd_ctl_elem_info *info)
 {
-	static char *texts[3] = {"TV Tuner", "FM", "Mic/Line"};
+	static const char *const texts[3] = {"TV Tuner", "FM", "Mic/Line"};
 
-	info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
-	info->count = 1;
-	info->value.enumerated.items = 3;
-	if (info->value.enumerated.item > 2)
-		info->value.enumerated.item = 2;
-	strcpy(info->value.enumerated.name, texts[info->value.enumerated.item]);
-	return 0;
+	return snd_ctl_enum_info(info, 1, 3, texts);
 }
 
 static int snd_bt87x_capture_source_get(struct snd_kcontrol *kcontrol,