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

Do not retain the old correction value when the timer was stopped.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/core/timer.c b/sound/core/timer.c
index 0f6e672..4fcc854 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1006,6 +1006,7 @@
 		timer->sticks = priv->last_expires - jiff;
 	else
 		timer->sticks = 1;
+	priv->correction = 0;
 	return 0;
 }