sched/rt: Code cleanup, remove a redundant function call

The second call to sched_rt_period() is redundant, because the value of the
rt_runtime was already read and it was protected by the ->rt_runtime_lock.

Signed-off-by: Shan Hai <haishan.bai@gmail.com>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1322535836-13590-2-git-send-email-haishan.bai@gmail.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/sched/rt.c

@@ -846,7 +846,7 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
 	if (rt_rq->rt_throttled)
 		return rt_rq_throttled(rt_rq);
 
-	if (sched_rt_runtime(rt_rq) >= sched_rt_period(rt_rq))
+	if (runtime >= sched_rt_period(rt_rq))
 		return 0;
 
 	balance_runtime(rt_rq);