PVS-Studio warning V537 for ReactOS

BOOL APIENTRY
GreStretchBltMask(....)
{
  ...
  MaskPoint.x += DCMask->ptlDCOrig.x;
  MaskPoint.y += DCMask->ptlDCOrig.x;
  ...
}

Most likely this is what should be written here: MaskPoint.y += DCMask->ptlDCOrig.y;

This suspicious code was found in ReactOS project by PVS-Studio static code analyzer.
Warning message is:
V537 Consider reviewing the correctness of 'x' item's usage. win32k bitblt.c 670

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/