workqueue: Clean code in alloc_and_link_pwqs()

wq->flags would not change, so it's not necessary to check if WQ_BH
is set in loop for_each_possible_cpu(), move define and set of pools
out of loop to simpliy the code.
Signed-off-by: Wenchao Hao <haowenchao22@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/workqueue.c

@@ -5461,16 +5461,17 @@ static int alloc_and_link_pwqs(struct workqueue_struct *wq)
 		goto enomem;
 
 	if (!(wq->flags & WQ_UNBOUND)) {
+		struct worker_pool __percpu *pools;
+
+		if (wq->flags & WQ_BH)
+			pools = bh_worker_pools;
+		else
+			pools = cpu_worker_pools;
+
 		for_each_possible_cpu(cpu) {
 			struct pool_workqueue **pwq_p;
-			struct worker_pool __percpu *pools;
 			struct worker_pool *pool;
 
-			if (wq->flags & WQ_BH)
-				pools = bh_worker_pools;
-			else
-				pools = cpu_worker_pools;
-
 			pool = &(per_cpu_ptr(pools, cpu)[highpri]);
 			pwq_p = per_cpu_ptr(wq->cpu_pwq, cpu);