PVS-Studio warning V590 for Notepad++

int Notepad_plus::getHtmlXmlEncoding(....) const
{
  ...
  if (langT != L_XML && langT != L_HTML && langT == L_PHP)
    return -1;
  ...
}

Currently this code is equivalent to if (langT == L_PHP). The programmer probably wanted to write this code: if (langT != L_XML && langT != L_HTML && langT != L_PHP).

This suspicious code was found in Notepad++ project by PVS-Studio static code analyzer.
Warning message is:
V590 Consider inspecting this expression. The expression is excessive or contains a misprint.  Notepad++  notepad_plus.cpp  853

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/