ALSA: ice1712: Simplify with snd_ctl_find_id_mixer()

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

Also, add the missing NULL checks in psc724_set_jack_state() to deal
with error cases.

Link: https://lore.kernel.org/r/20230720082108.31346-7-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ice1712/juli.c

@@ -408,22 +408,13 @@ static const char * const follower_vols[] = {
 static
 DECLARE_TLV_DB_SCALE(juli_master_db_scale, -6350, 50, 1);
 
-static struct snd_kcontrol *ctl_find(struct snd_card *card,
-				     const char *name)
-{
-	struct snd_ctl_elem_id sid = {0};
-
-	strscpy(sid.name, name, sizeof(sid.name));
-	sid.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
-	return snd_ctl_find_id(card, &sid);
-}
-
 static void add_followers(struct snd_card *card,
 			  struct snd_kcontrol *master,
 			  const char * const *list)
 {
 	for (; *list; list++) {
-		struct snd_kcontrol *follower = ctl_find(card, *list);
+		struct snd_kcontrol *follower =
+			snd_ctl_find_id_mixer(card, *list);
 		/* dev_dbg(card->dev, "add_followers - %s\n", *list); */
 		if (follower) {
 			/* dev_dbg(card->dev, "follower %s found\n", *list); */

sound/pci/ice1712/psc724.c

@@ -177,7 +177,6 @@ static bool psc724_get_master_switch(struct snd_ice1712 *ice)
 static void psc724_set_jack_state(struct snd_ice1712 *ice, bool hp_connected)
 {
 	struct psc724_spec *spec = ice->spec;
-	struct snd_ctl_elem_id elem_id;
 	struct snd_kcontrol *kctl;
 	u16 power = spec->wm8776.regs[WM8776_REG_PWRDOWN] & ~WM8776_PWR_HPPD;
 
@@ -187,17 +186,15 @@ static void psc724_set_jack_state(struct snd_ice1712 *ice, bool hp_connected)
 	snd_wm8776_set_power(&spec->wm8776, power);
 	spec->hp_connected = hp_connected;
 	/* notify about master speaker mute change */
-	memset(&elem_id, 0, sizeof(elem_id));
-	elem_id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
-	strscpy(elem_id.name, "Master Speakers Playback Switch",
-						sizeof(elem_id.name));
-	kctl = snd_ctl_find_id(ice->card, &elem_id);
-	snd_ctl_notify(ice->card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
+	kctl = snd_ctl_find_id_mixer(ice->card,
+				     "Master Speakers Playback Switch");
+	if (kctl)
+		snd_ctl_notify(ice->card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
 	/* and headphone mute change */
-	strscpy(elem_id.name, spec->wm8776.ctl[WM8776_CTL_HP_SW].name,
-						sizeof(elem_id.name));
-	kctl = snd_ctl_find_id(ice->card, &elem_id);
-	snd_ctl_notify(ice->card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
+	kctl = snd_ctl_find_id_mixer(ice->card,
+				     spec->wm8776.ctl[WM8776_CTL_HP_SW].name);
+	if (kctl)
+		snd_ctl_notify(ice->card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
 }
 
 static void psc724_update_hp_jack_state(struct work_struct *work)

sound/pci/ice1712/quartet.c

@@ -766,21 +766,12 @@ static const char * const follower_vols[] = {
 static
 DECLARE_TLV_DB_SCALE(qtet_master_db_scale, -6350, 50, 1);
 
-static struct snd_kcontrol *ctl_find(struct snd_card *card,
-				     const char *name)
-{
-	struct snd_ctl_elem_id sid = {0};
-
-	strscpy(sid.name, name, sizeof(sid.name));
-	sid.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
-	return snd_ctl_find_id(card, &sid);
-}
-
 static void add_followers(struct snd_card *card,
 			  struct snd_kcontrol *master, const char * const *list)
 {
 	for (; *list; list++) {
-		struct snd_kcontrol *follower = ctl_find(card, *list);
+		struct snd_kcontrol *follower =
+			snd_ctl_find_id_mixer(card, *list);
 		if (follower)
 			snd_ctl_add_follower(master, follower);
 	}

sound/pci/ice1712/wm8776.c

@@ -34,13 +34,9 @@ static void snd_wm8776_activate_ctl(struct snd_wm8776 *wm,
 	struct snd_card *card = wm->card;
 	struct snd_kcontrol *kctl;
 	struct snd_kcontrol_volatile *vd;
-	struct snd_ctl_elem_id elem_id;
 	unsigned int index_offset;
 
-	memset(&elem_id, 0, sizeof(elem_id));
-	strscpy(elem_id.name, ctl_name, sizeof(elem_id.name));
-	elem_id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
-	kctl = snd_ctl_find_id(card, &elem_id);
+	kctl = snd_ctl_find_id_mixer(card, ctl_name);
 	if (!kctl)
 		return;
 	index_offset = snd_ctl_get_ioff(kctl, &kctl->id);