Fix error on websocket exit on uWSGI (Fixes #330)

src/engineio/async_drivers/gevent_uwsgi.py

@@ -60,14 +60,14 @@ def select_greenlet_runner(fd, event):
                 self._event)
 
         self.app(self)
+        uwsgi.disconnect()
 
     def close(self):
         """Disconnects uWSGI from the client."""
         if self._req_ctx is None:
             # better kill it here in case wait() is not called again
             self._select_greenlet.kill()
             self._event.set()
-        uwsgi.disconnect()
 
     def _send(self, msg):
         """Transmits message either in binary or UTF-8 text mode,