message: fix warning found by clang
diff: @@ -196,8 +196,10 @@ namespace ospray {
  }
  }
  - void Importer::importRegistryGenerator(std::shared_ptr<Node> world,
  - const std::string &type) const
  + // TODO: Implement a registry for data "generators" which don't require
  + // an input file.
  + void Importer::importRegistryGenerator(std::shared_ptr<Node> /*world*/,
  + const std::string &/*type*/) const
  {
  #if 0
  // Function pointer type for creating a concrete instance of a subtype of
  