PVS-Studio warning V501 for WinMerge

BUFFERTYPE m_nBufferType[2];
...
// Handle unnamed buffers
if ((m_nBufferType[nBuffer] == BUFFER_UNNAMED) ||
    (m_nBufferType[nBuffer] == BUFFER_UNNAMED))
  nSaveErrorCode = SAVE_NO_FILENAME;

If we look at the code nearby, the following should be written here by analogy: (m_nBufferType[0] == BUFFER_UNNAMED) || (m_nBufferType[1] == BUFFER_UNNAMED).

This suspicious code was found in WinMerge 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

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/