ext4: missing unlock in ext4_clear_request_list()

If the the li_request_list was empty then it returned with the lock
held. Instead of adding a "goto unlock" I just removed that special
case and let it go past the empty list_for_each_safe().

Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: "Theodore Ts'o" <[e-mail]>

fs/ext4/super.c

···
 	struct ext4_li_request *elr;
 
 	mutex_lock(&ext4_li_info->li_list_mtx);
-	if (list_empty(&ext4_li_info->li_request_list))
-		return;
-
 	list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
 		elr = list_entry(pos, struct ext4_li_request,
 				 lr_request);