message: Fix leak in node_id::deserialize()
diff: @@ -213,7 +213,7 @@ error node_id::deserialize(deserializer& source) {
  }
  if (impl == atom("default")) {
  if (data_ == nullptr || data_->implementation_id() != atom("default"))
  - data_.reset(new default_data);
  + data_.reset(new default_data, false);
  return data_->deserialize(source);
  }
  return sec::unknown_type;
  