message: Updated quantize_model.cc
  Fixed warning in the file
diff: @@ -38,7 +38,7 @@ TfLiteStatus QuantizeModel(flatbuffers::FlatBufferBuilder* builder,
  subgraph_idx++) {
  SubGraphT* subgraph = model->subgraphs.at(subgraph_idx).get();
  internal::SubgraphQuantizer quantizer(model, subgraph, error_reporter);
  - for (int op_idx = 0; op_idx < subgraph->operators.size(); op_idx++) {
  + for (size_t op_idx = 0; op_idx < subgraph->operators.size(); op_idx++) {
  auto status = quantizer.QuantizeOperator(op_idx);
  if (status != kTfLiteOk) {
  OperatorT* op = subgraph->operators[op_idx].get();
  