fix unreachable code

Author: dirixmjm

plugwise_usb/network/__init__.py

@@ -517,8 +517,6 @@ async def discover_nodes(self, load: bool = True) -> bool:
             await self.start(load=load)
         return True
 
-        return True
-
     async def stop(self) -> None:
         """Stop network discovery."""
         _LOGGER.debug("Stopping")