sched: Use swap() macro in scale_stime()

Simple cleanup.
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1367501673-6563-1-git-send-email-sgruszka@redhat.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

kernel/sched/cputime.c

@@ -515,9 +515,8 @@ static cputime_t scale_stime(u64 stime, u64 rtime, u64 total)
 
 	for (;;) {
 		/* Make sure "rtime" is the bigger of stime/rtime */
-		if (stime > rtime) {
-			u64 tmp = rtime; rtime = stime; stime = tmp;
-		}
+		if (stime > rtime)
+			swap(rtime, stime);
 
 		/* Make sure 'total' fits in 32 bits */
 		if (total >> 32)