According to LSB specification init-script should return 0 on stop command
when program is not running.

debian/init.d

diff --git a/debian/init.d b/debian/init.d
index 2176862..f2a5002 100644
--- a/debian/init.d
+++ b/debian/init.d
@@ -45,7 +45,7 @@
     #   1 if daemon was already stopped
     #   2 if daemon could not be stopped
     #   other if a failure occurred
-    start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
+    start-stop-daemon --stop --quiet --oknodo --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
     RETVAL="$?"
     rm -f $PIDFILE
     return "$RETVAL"