Pass locked object rather than just connection to stream constructor (246)

Author: fredthomsen

hyper/http20/connection.py

@@ -572,11 +572,11 @@ def _new_stream(self, stream_id=None, local_closed=False):
         # self.next_stream_id in a consistent state
         #
         # No I/O occurs, the delay in waiting threads depends on their number.
-        with self._lock, self._conn as conn:
+        with self._lock:
             s = Stream(
                 stream_id or self.next_stream_id,
                 self.__wm_class(DEFAULT_WINDOW_SIZE),
-                conn,
+                self._conn,
                 self._send_cb,
                 self._recv_cb,
                 self._stream_close_cb,