workqueue: use LIST_HEAD to initialize cull_list

Use LIST_HEAD() to initialize cull_list instead of open-coding it.
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Lai Jiangshan <jiangshanlai@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/workqueue.c

@@ -2304,9 +2304,8 @@ static void idle_worker_timeout(struct timer_list *t)
 static void idle_cull_fn(struct work_struct *work)
 {
 	struct worker_pool *pool = container_of(work, struct worker_pool, idle_cull_work);
-	struct list_head cull_list;
+	LIST_HEAD(cull_list);
 
-	INIT_LIST_HEAD(&cull_list);
 	/*
 	 * Grabbing wq_pool_attach_mutex here ensures an already-running worker
 	 * cannot proceed beyong worker_detach_from_pool() in its self-destruct
@@ -3872,10 +3871,8 @@ static void rcu_free_pool(struct rcu_head *rcu)
 static void put_unbound_pool(struct worker_pool *pool)
 {
 	DECLARE_COMPLETION_ONSTACK(detach_completion);
-	struct list_head cull_list;
 	struct worker *worker;
-
-	INIT_LIST_HEAD(&cull_list);
+	LIST_HEAD(cull_list);
 
 	lockdep_assert_held(&wq_pool_mutex);