PVS-Studio warning V501 for Chromium

bool FileIOTest::MatchesResult(const TestStep& a,
                               const TestStep& b) {
  ....
  return (a.data_size == a.data_size &&
          std::equal(a.data, a.data + a.data_size, b.data));
}

This suspicious code was found in Chromium project by PVS-Studio static code analyzer.
Warning message is:
V501 There are identical sub-expressions to the left and to the right of the '==' operator: a.data_size == a.data_size cdm_file_io_test.cc 367

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/