io_uring: remove unused wq_list_merge

There are no users of wq_list_merge, kill it.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/5f9ad0301949213230ad9000a8359d591aae615a.1677002255.git.asml.silence@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/slist.h

@@ -27,28 +27,6 @@ static inline void wq_list_add_after(struct io_wq_work_node *node,
 		list->last = node;
 }
 
-/**
- * wq_list_merge - merge the second list to the first one.
- * @list0: the first list
- * @list1: the second list
- * Return the first node after mergence.
- */
-static inline struct io_wq_work_node *wq_list_merge(struct io_wq_work_list *list0,
-						    struct io_wq_work_list *list1)
-{
-	struct io_wq_work_node *ret;
-
-	if (!list0->first) {
-		ret = list1->first;
-	} else {
-		ret = list0->first;
-		list0->last->next = list1->first;
-	}
-	INIT_WQ_LIST(list0);
-	INIT_WQ_LIST(list1);
-	return ret;
-}
-
 static inline void wq_list_add_tail(struct io_wq_work_node *node,
 				    struct io_wq_work_list *list)
 {