Fix typo that set a module instead of attribute to None

Author: codingjoe

yeelib/devices.py

@@ -81,7 +81,7 @@ async def send_command(self, method, params):
                 response = (await reader.readline()).decode()
             except OSError:
                 logger.exception("Connection error")
-                socket.socket = None
+                self.socket = None
             else:
                 if response is not None:
                     logger.debug("%s: ... %s",