hrtimer: fix timerqueue conversion flub

In converting the hrtimers to timerqueue, I missed
a spot in hrtimer_run_queues where we loop running
timers. We end up not pulling the new next value out
and instead just use the last next value, causing
boot time hangs in some cases.

The proper fix is to pull timerqueue_getnext each iteration
instead of using a local next value.
Reported-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NJohn Stultz <john.stultz@linaro.org>

kernel/hrtimer.c

@@ -1412,11 +1412,8 @@ void hrtimer_run_queues(void)
 		return;
 
 	for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) {
-		struct timerqueue_node *next;
-
 		base = &cpu_base->clock_base[index];
-		next = timerqueue_getnext(&base->active);
-		if (!next)
+		if (!timerqueue_getnext(&base->active))
 			continue;
 
 		if (gettime) {
@@ -1426,7 +1423,7 @@ void hrtimer_run_queues(void)
 
 		raw_spin_lock(&cpu_base->lock);
 
-		while ((node = next)) {
+		while ((node = timerqueue_getnext(&base->active))) {
 			struct hrtimer *timer;
 
 			timer = container_of(node, struct hrtimer, node);