PVS-Studio warning V579 for Dolphin

void drawShadedTexSubQuad(...,
  const MathUtil::Rectangle<float>* rDest, ...)
{
  ...
  if (stsq_observer ||
      memcmp(rDest, &tex_sub_quad_data.rdest,
             sizeof(rDest)) != 0 ||
      tex_sub_quad_data.u1 != u1 ||
      tex_sub_quad_data.v1 != v1 ||
      tex_sub_quad_data.u2 != u2 ||
      tex_sub_quad_data.v2 != v2 ||
      tex_sub_quad_data.G != G)
  ...
}

This suspicious code was found in Dolphin project by PVS-Studio static code analyzer.
Warning message is:
V579 The memcmp function receives the pointer and its size as arguments. It is possibly a mistake. Inspect the third argument. VideoDX11 d3dutil.cpp 598

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/