PVS-Studio warning V512 for ReactOS

#define IsEqualGUID(rguid1, rguid2) \
  (!memcmp(&(rguid1), &(rguid2), sizeof(GUID)))

static int ctl2_find_guid(....)
{
  MSFT_GuidEntry *guidentry;
  ...
  if (IsEqualGUID(guidentry, guid)) return offset;
  ...
}

Macros are evil! They can hide errors very well. The error is this: guidentry is a pointer.
This is what should have been written here: if (IsEqualGUID(*guidentry, guid)) return offset;


This suspicious code was found in ReactOS project by PVS-Studio static code analyzer.
Warning message is:
V512 A call of the 'memcmp' function will lead to underflow of the buffer 'guidentry'. oleaut32 typelib2.c 320

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/