torture: Save a line in stutter_wait(): while -> for

Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>

kernel/torture.c

@@ -576,7 +576,7 @@ void stutter_wait(const char *title)
 
 	cond_resched_rcu_qs();
 	spt = READ_ONCE(stutter_pause_test);
-	while (spt) {
+	for (; spt; spt = READ_ONCE(stutter_pause_test)) {
 		if (spt == 1) {
 			schedule_timeout_interruptible(1);
 		} else if (spt == 2) {
@@ -586,7 +586,6 @@ void stutter_wait(const char *title)
 			schedule_timeout_interruptible(round_jiffies_relative(HZ));
 		}
 		torture_shutdown_absorb(title);
-		spt = READ_ONCE(stutter_pause_test);
 	}
 }
 EXPORT_SYMBOL_GPL(stutter_wait);