ALSA: timer: Make snd_timer_close() returning void

The function doesn't return any useful value, so let's make it void to
be clearer.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20191107192008.32331-3-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/timer.h

@@ -119,7 +119,7 @@ int snd_timer_global_free(struct snd_timer *timer);
 int snd_timer_global_register(struct snd_timer *timer);
 
 int snd_timer_open(struct snd_timer_instance **ti, char *owner, struct snd_timer_id *tid, unsigned int slave_id);
-int snd_timer_close(struct snd_timer_instance *timeri);
+void snd_timer_close(struct snd_timer_instance *timeri);
 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri);
 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks);
 int snd_timer_stop(struct snd_timer_instance *timeri);

sound/core/timer.c

@@ -229,7 +229,7 @@ static int snd_timer_check_master(struct snd_timer_instance *master)
 	return err < 0 ? err : 0;
 }
 
-static int snd_timer_close_locked(struct snd_timer_instance *timeri,
+static void snd_timer_close_locked(struct snd_timer_instance *timeri,
 				   struct device **card_devp_to_put);
 
 /*
@@ -351,7 +351,7 @@ EXPORT_SYMBOL(snd_timer_open);
  * close a timer instance
  * call this with register_mutex down.
  */
-static int snd_timer_close_locked(struct snd_timer_instance *timeri,
+static void snd_timer_close_locked(struct snd_timer_instance *timeri,
 				   struct device **card_devp_to_put)
 {
 	struct snd_timer *timer = timeri->timer;
@@ -414,28 +414,24 @@ static int snd_timer_close_locked(struct snd_timer_instance *timeri,
 			*card_devp_to_put = &timer->card->card_dev;
 		module_put(timer->module);
 	}
-
-	return 0;
 }
 
 /*
  * close a timer instance
  */
-int snd_timer_close(struct snd_timer_instance *timeri)
+void snd_timer_close(struct snd_timer_instance *timeri)
 {
 	struct device *card_dev_to_put = NULL;
-	int err;
 
 	if (snd_BUG_ON(!timeri))
-		return -ENXIO;
+		return;
 
 	mutex_lock(&register_mutex);
-	err = snd_timer_close_locked(timeri, &card_dev_to_put);
+	snd_timer_close_locked(timeri, &card_dev_to_put);
 	mutex_unlock(&register_mutex);
 	/* put_device() is called after unlock for avoiding deadlock */
 	if (card_dev_to_put)
 		put_device(card_dev_to_put);
-	return err;
 }
 EXPORT_SYMBOL(snd_timer_close);