Add missing return

Author: bouwew

plugwise_usb/connection/sender.py

@@ -87,6 +87,7 @@ async def write_request_to_port(self, request: PlugwiseRequest) -> None:
             self._stick_response.cancel()
             self._stick_lock.release()
             self._processed_msgs += 1
+            return
 
         # Wait for USB stick to accept request
         try: