message: Fix warnings in pnet_datalink tests
diff: @@ -300,8 +300,8 @@ mod tests {
  fn create_net() -> (
  Sender<io::Result<Box<[u8]>>>,
  Receiver<Box<[u8]>>,
  - Box<DataLinkSender>,
  - Box<DataLinkReceiver>,
  + Box<dyn DataLinkSender>,
  + Box<dyn DataLinkReceiver>,
  ) {
  let interface = super::dummy_interface(56);
  let mut config = super::Config::default();
  