message: Fix clang-tidy suggestion in roundtrip.cpp.
diff: @@ -334,11 +334,11 @@ class RoundTripTracer final : public UHDM::UhdmListener {
  --line;
  content[line].reserve(content[line].size() + data.size());
  - for (size_t i = 0; i < data.length(); ++i) {
  - if (data[i] == kOverwriteMarker) {
  + for (char c : data) {
  + if (c == kOverwriteMarker) {
  content[line].push_back(' ');
  } else {
  - content[line].push_back(data[i]);
  + content[line].push_back(c);
  }
  }
  }
  