message: clean up unused variable left by removing consumed_input
diff: @@ -144,8 +144,6 @@ void OpSchema::Verify(const NodeProto& node) const {
  // Check attributes
  std::unordered_set<std::string> seen_attr_names{};
  - const AttributeProto* consume_attr = nullptr;
  -
  for (const auto& attr_proto : node.attribute()) {
  const auto& name = attr_proto.name();
  