ck: revert time accounting "fix" that produced time anomalies with 'ps'

Reported in, http://techpatterns.com/forums/about2228.html

kernel/sched/bfs.c

@@ -7491,9 +7491,9 @@ void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
 	rtime = nsecs_to_cputime(p->sched_time);
 
 	if (total) {
-		u64 temp = rtime;
+		u64 temp;
 
-		temp *= utime;
+		temp = (u64)(rtime * utime);
 		do_div(temp, total);
 		utime = (cputime_t)temp;
 	} else
@@ -7524,9 +7524,9 @@ void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
 	rtime = nsecs_to_cputime(cputime.sum_exec_runtime);
 
 	if (total) {
-		u64 temp = rtime;
+		u64 temp;
 
-		temp *= cputime.utime;
+		temp = (u64)(rtime * cputime.utime);
 		do_div(temp, total);
 		utime = (cputime_t)temp;
 	} else