ALSA: core: update comment on snd_card.controls_rwsem

Since commit 5bbb1ab5 ("control: use counting semaphore as write lock
for ELEM_WRITE operation"), this has been locking the controls including
their values, not just the list of controls.
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230428095941.1706278-6-oswald.buddenhagen@gmx.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/core.h

@@ -98,7 +98,7 @@ struct snd_card {
 
 	struct device ctl_dev;		/* control device */
 	unsigned int last_numid;	/* last used numeric ID */
-	struct rw_semaphore controls_rwsem;	/* controls list lock */
+	struct rw_semaphore controls_rwsem;	/* controls lock (list and values) */
 	rwlock_t ctl_files_rwlock;	/* ctl_files list lock */
 	int controls_count;		/* count of all controls */
 	size_t user_ctl_alloc_size;	// current memory allocation by user controls.