ALSA: core: trivial code style fix

remove trailing tab on the line.
Signed-off-by: Lu Guanqun <guanqun.lu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/control.c

@@ -1072,7 +1072,7 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
 	long private_size;
 	struct user_element *ue;
 	int idx, err;
-	
+
 	if (card->user_ctl_count >= MAX_USER_CONTROLS)
 		return -ENOMEM;
 	if (info->count < 1)