radvd: eliminate confusing warnings when stop service

When run 'service radvd stop' in case radvd is not started/running,
we'll get warnings like this:

Stopping radvd: no /usr/sbin/radvd found; none killed
/etc/init.d/radvd: warning: cannot restore settings
radvd.

We could by pass these OPs by just check if the service is running
or not so eliminate possible warnings.

Signed-off-by: Liang Li <liang.li@windriver.com>
Signed-off-by: Joe MacDonald <joe@deserted.net>

meta-networking/recipes-daemons/radvd/files/radvd.init

@@ -92,6 +92,10 @@ case "$1" in
 	;;
   stop)
 	echo -n "Stopping $DESC: "
+	if ! [ -f $PIDFILE ] ; then
+		echo "not running."
+		exit 0
+	fi
 	start-stop-daemon --oknodo --stop --pidfile $PIDFILE \
 		--exec $DAEMON
 	restore_settings $SAVED_SETTINGS