PVS-Studio warning V501 for OpenCV

void CvDTreeTrainData::read_params(....)
{
  ....
  if( cat_var_count != cat_var_count ||
      ord_var_count != ord_var_count )
    CV_ERROR(CV_StsParseError,
      "var_type is inconsistent with "
      "cat_var_count and ord_var_count");
  ....
}

This suspicious code was found in OpenCV 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: cat_var_count != cat_var_count tree.cpp 1415

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/