ALSA: via82xx: Simplify with snd_ctl_find_id_mixer()

Replace an open code with the new snd_ctl_find_id_mixer().
There is no functional change.

Link: https://lore.kernel.org/r/20230720082108.31346-9-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/via82xx.c

@@ -1984,11 +1984,7 @@ static int snd_via8233_init_misc(struct via82xx *chip)
 		/* when no h/w PCM volume control is found, use DXS volume control
 		 * as the PCM vol control
 		 */
-		struct snd_ctl_elem_id sid;
-		memset(&sid, 0, sizeof(sid));
-		strcpy(sid.name, "PCM Playback Volume");
-		sid.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
-		if (! snd_ctl_find_id(chip->card, &sid)) {
+		if (!snd_ctl_find_id_mixer(chip->card, "PCM Playback Volume")) {
 			dev_info(chip->card->dev,
 				 "Using DXS as PCM Playback\n");
 			err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_via8233_pcmdxs_volume_control, chip));