message: Silence warning from GCC
diff: @@ -162,16 +162,16 @@ void TechnologyCatalog::readCategories(NAS2D::Xml::XmlElement& node)
  void TechnologyCatalog::readTechnologiesInCategory(const std::string& categoryName, NAS2D::Xml::XmlElement& category)
  {
  - for (auto technology = category.firstChildElement(); technology; technology = technology->nextSiblingElement())
  + for (auto technologyNode = category.firstChildElement(); technologyNode; technologyNode = technologyNode->nextSiblingElement())
  {
  - Technology tech = readTechnology(*technology);
  + Technology tech = readTechnology(*technologyNode);
  auto& technologies = mCategories[categoryName];
  const auto it = std::find_if(technologies.begin(), technologies.end(), [tech](const Technology& technology) { return technology.id == tech.id; });
  if (it != technologies.end())
  {
  throw std::runtime_error("TechnologyReader: Technology ID redefinition '" + std::to_string(tech.id) +
  - "' at (" + std::to_string(technology->row()) + ", " + std::to_string(technology->column()) + ")");
  + "' at (" + std::to_string(technologyNode->row()) + ", " + std::to_string(technologyNode->column()) + ")");
  }
  technologies.push_back(tech);
  