workqueue: Make workqueue_init*() return void

The return values of workqueue_init() and workqueue_early_int() are
always 0, and there is no usage of their return value.  So just make
them return void.
Signed-off-by: Yu Chen <chen.yu@easystack.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>

include/linux/workqueue.h

@@ -649,7 +649,7 @@ int workqueue_online_cpu(unsigned int cpu);
 int workqueue_offline_cpu(unsigned int cpu);
 #endif
 
-int __init workqueue_init_early(void);
-int __init workqueue_init(void);
+void __init workqueue_init_early(void);
+void __init workqueue_init(void);
 
 #endif

kernel/workqueue.c

@@ -5896,7 +5896,7 @@ static void __init wq_numa_init(void)
  * items.  Actual work item execution starts only after kthreads can be
  * created and scheduled right before early initcalls.
  */
-int __init workqueue_init_early(void)
+void __init workqueue_init_early(void)
 {
 	int std_nice[NR_STD_WORKER_POOLS] = { 0, HIGHPRI_NICE_LEVEL };
 	int hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
@@ -5963,8 +5963,6 @@ int __init workqueue_init_early(void)
 	       !system_unbound_wq || !system_freezable_wq ||
 	       !system_power_efficient_wq ||
 	       !system_freezable_power_efficient_wq);
-
-	return 0;
 }
 
 /**
@@ -5976,7 +5974,7 @@ int __init workqueue_init_early(void)
  * are no kworkers executing the work items yet.  Populate the worker pools
  * with the initial workers and enable future kworker creations.
  */
-int __init workqueue_init(void)
+void __init workqueue_init(void)
 {
 	struct workqueue_struct *wq;
 	struct worker_pool *pool;
@@ -6023,6 +6021,4 @@ int __init workqueue_init(void)
 
 	wq_online = true;
 	wq_watchdog_init();
-
-	return 0;
 }