asyncio: pipe_data_received: call _on_error

`_on_stderr` does not exist.

Author: blueyed

pynvim/msgpack_rpc/event_loop/asyncio.py

@@ -68,7 +68,7 @@ def pipe_connection_lost(self, fd, exc):
     def pipe_data_received(self, fd, data):
         """Used to signal `asyncio.SubprocessProtocol` of incoming data."""
         if fd == 2:  # stderr fd number
-            self._on_stderr(data)
+            self._on_error(data)
         elif self._on_data:
             self._on_data(data)
         else: