cleanup rc.openvpn code

src/etc/rc.openvpn

@@ -86,7 +86,7 @@ if(is_array($config['openvpn']['openvpn-server']) || is_array($config['openvpn']
 $openvpnlck = try_lock('openvpn', 10);
 if (!$openvpnlck) {
 	log_error(gettext("Could not obtain openvpn lock for executing rc.openvpn for more than 10 seconds continuing..."));
-	unlock_force('openvpn');
+	@unlink("/tmp/openvpn.lock");
 	$openvpnlck = lock('openvpn', LOCK_EX);
 }