leds: is31fl319x: Use devm_mutex_init()

Use devm_mutex_init() instead of hand-writing it.

This saves some LoC, improves readability and saves some space in the
generated .o file.

Before:
======
   text	   data	    bss	    dec	    hex	filename
  20011	   6752	    128	  26891	   690b	drivers/leds/leds-is31fl319x.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  19715	   6680	    128	  26523	   679b	drivers/leds/leds-is31fl319x.o

Signed-off-by: Christophe JAILLET <[email protected]>
Link: https://lore.kernel.org/r/267aba6eab12be67c297fcd52fcf45a0856338bb.1757240150.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Lee Jones <[email protected]>

Author: tititiou36

drivers/leds/leds-is31fl319x.c

@@ -483,11 +483,6 @@ static inline int is31fl3196_db_to_gain(u32 dezibel)
 	return dezibel / IS31FL3196_AUDIO_GAIN_DB_STEP;
 }
 
-static void is31f1319x_mutex_destroy(void *lock)
-{
-	mutex_destroy(lock);
-}
-
 static int is31fl319x_probe(struct i2c_client *client)
 {
 	struct is31fl319x_chip *is31;
@@ -503,8 +498,7 @@ static int is31fl319x_probe(struct i2c_client *client)
 	if (!is31)
 		return -ENOMEM;
 
-	mutex_init(&is31->lock);
-	err = devm_add_action_or_reset(dev, is31f1319x_mutex_destroy, &is31->lock);
+	err = devm_mutex_init(dev, &is31->lock);
 	if (err)
 		return err;