message: remove unused value (fix warnings)
diff: @@ -278,7 +278,7 @@ impl error::Error for Error {
  Error::PayloadError(ref err) => Some(err),
  Error::CBorEncoding(ref err) => Some(err),
  Error::InvalidPayloadAddressing(_) => None,
  - Error::CannotReconstructAddress(addr) => None,
  + Error::CannotReconstructAddress(_) => None,
  }
  }
  }
  