PVS-Studio warning V512 for NetXMS

typedef WCHAR TCHAR, *PTCHAR;

static BOOL MatchProcess(....)
{
  ....
  TCHAR commandLine[MAX_PATH];
  ....
  memset(commandLine, 0, MAX_PATH);
  ....
}

This suspicious code was found in NetXMS project by PVS-Studio static code analyzer.
Warning message is:
V512 A call of the 'memset' function will lead to underflow of the buffer 'commandLine'. procinfo.cpp 278

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/