sched: fix /proc/<PID>/stat stime/utime monotonicity, part 2

Extend Peter's patch to fix accounting issues, by keeping stime
monotonic too.

Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Tested-by: Frans Pop <elendil@planet.nl>
diff --git a/kernel/fork.c b/kernel/fork.c
index a65bfc4..28a7401 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1057,6 +1057,7 @@
 	p->utimescaled = cputime_zero;
 	p->stimescaled = cputime_zero;
 	p->prev_utime = cputime_zero;
+	p->prev_stime = cputime_zero;
 
 #ifdef CONFIG_TASK_XACCT
 	p->rchar = 0;		/* I/O counter: bytes read */