[Modify] Move it

Author: sta

websocket-sharp/Net/HttpListener.cs

@@ -813,15 +813,15 @@ public void Stop ()
         if (!_listening)
           return;
 
-        EndPointManager.RemoveListener (this);
-
         cleanupContextQueue (true);
         cleanupContextRegistry ();
 
         var msg = "The listener is stopped.";
         var ex = new HttpListenerException (995, msg);
         cleanupWaitQueue (ex);
 
+        EndPointManager.RemoveListener (this);
+
         _listening = false;
       }
     }