PVS-Studio warning V512 for FAR

__int64 FileList::VMProcess(int OpCode,void *vParam,
                            __int64 iParam)
{
  ...
  PluginInfo *PInfo=(PluginInfo *)vParam;
  memset(PInfo,0,sizeof(PInfo));
  PInfo->StructSize=sizeof(PInfo);
  ...
}

This is what should have been written here: memset(PInfo, 0, sizeof(PluginInfo));

This suspicious code was found in FAR project by PVS-Studio static code analyzer.
Warning message is:
V512 A call of the 'memset' function will lead to underflow of the buffer 'PInfo'. far filelist.cpp 672

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/