sched: remove 'now' use from assignments

change all 'now' timestamp uses in assignments to rq->clock.

( this is an identity transformation that causes no functionality change:
  all such new rq->clock is necessarily preceded by an update_rq_clock()
  call. )

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched.c b/kernel/sched.c
index 65eb484..49a5fb0 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -788,8 +788,8 @@
 	u64 start;
 
 	start = ls->load_update_start;
-	ls->load_update_start = now;
-	ls->delta_stat += now - start;
+	ls->load_update_start = rq->clock;
+	ls->delta_stat += rq->clock - start;
 	/*
 	 * Stagger updates to ls->delta_fair. Very frequent updates
 	 * can be expensive.
@@ -1979,8 +1979,8 @@
 	exec_delta64 = ls->delta_exec + 1;
 	ls->delta_exec = 0;
 
-	sample_interval64 = now - ls->load_update_last;
-	ls->load_update_last = now;
+	sample_interval64 = this_rq->clock - ls->load_update_last;
+	ls->load_update_last = this_rq->clock;
 
 	if ((s64)sample_interval64 < (s64)TICK_NSEC)
 		sample_interval64 = TICK_NSEC;