posix-cpu-timers: Save interval only for armed timers

There is no point to return the interval for timers which have been
disarmed.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

kernel/time/posix-cpu-timers.c

@@ -809,10 +809,9 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec64 *itp
 
 	rcu_read_lock();
 	p = cpu_timer_task_rcu(timer);
-	if (p) {
+	if (p && cpu_timer_getexpires(&timer->it.cpu)) {
 		itp->it_interval = ktime_to_timespec64(timer->it_interval);
 
-		if (cpu_timer_getexpires(&timer->it.cpu)) {
 		if (CPUCLOCK_PERTHREAD(timer->it_clock))
 			now = cpu_clock_sample(clkid, p);
 		else
@@ -820,7 +819,6 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec64 *itp
 
 		__posix_cpu_timer_get(timer, itp, now);
 	}
-	}
 	rcu_read_unlock();
 }