[Fix] Move them out

As a preventive move. See: issue #235

websocket-sharp/Net/HttpListener.cs

@@ -406,12 +406,12 @@ namespace WebSocketSharp.Net
       lock (_ctxRegistrySync) {
         if (!force)
           sendServiceUnavailable ();
+      }
 
       cleanupContextRegistry ();
       cleanupConnections ();
       cleanupWaitQueue ();
     }
-    }
 
     private void cleanupConnections ()
     {