[ALSA] system timer: clear correction value when timer stops

Do not retain the old correction value when the timer was stopped.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>
Signed-off-by: NJaroslav Kysela <perex@suse.cz>

sound/core/timer.c

@@ -1006,6 +1006,7 @@ static int snd_timer_s_stop(struct snd_timer * timer)
 		timer->sticks = priv->last_expires - jiff;
 	else
 		timer->sticks = 1;
+	priv->correction = 0;
 	return 0;
 }