[PATCH] sched: use cached variable in sys_sched_yield()

In sys_sched_yield(), we cache current->array in the "array" variable, thus
there's no need to dereference "current" again later.
Signed-Off-By: Renaud Lienhart <renaud.lienhart@free.fr>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/sched.c

@@ -3938,7 +3938,7 @@ asmlinkage long sys_sched_yield(void)
 	if (rt_task(current))
 		target = rq->active;
 
-	if (current->array->nr_active == 1) {
+	if (array->nr_active == 1) {
 		schedstat_inc(rq, yld_act_empty);
 		if (!rq->expired->nr_active)
 			schedstat_inc(rq, yld_both_empty);