ALSA: hda/analog: Use guard() for mutex locks

Replace the manual mutex lock/unlock pairs with guard().

Only code refactoring, and no behavior change.

Signed-off-by: Takashi Iwai <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

sound/hda/codecs/analog.c

···
 	if (spec->cur_smux == val)
 		return 0;
 
-	mutex_lock(&codec->control_mutex);
+	guard(mutex)(&codec->control_mutex);
 	path = snd_hda_get_path_from_idx(codec,
 					 spec->smux_paths[spec->cur_smux]);
 	if (path)
···
 	if (path)
 		snd_hda_activate_path(codec, path, true, true);
 	spec->cur_smux = val;
-	mutex_unlock(&codec->control_mutex);
 	return 1;
 }