Fix scanline increment for 32bpp stretch blts

reactos/subsys/win32k/dib

diff -u -r1.16 -r1.17
--- dib32bpp.c	1 Apr 2004 19:31:05 -0000	1.16
+++ dib32bpp.c	4 Apr 2004 16:40:05 -0000	1.17
@@ -16,7 +16,7 @@

  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

-/* $Id: dib32bpp.c,v 1.16 2004/04/01 19:31:05 gvg Exp $ */

+/* $Id: dib32bpp.c,v 1.17 2004/04/04 16:40:05 gvg Exp $ */

 #undef WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <stdlib.h>

@@ -391,7 +391,7 @@

                   int TgtWidth, int TgtHeight, int srcPitch, int dstPitch)
 {
   int NumPixels = TgtHeight;

-  int IntPart = ((SrcHeight / TgtHeight) * srcPitch) >> 1; //(SrcHeight / TgtHeight) * SrcWidth;

+  int IntPart = ((SrcHeight / TgtHeight) * srcPitch) / 4; //(SrcHeight / TgtHeight) * SrcWidth;

   int FractPart = SrcHeight % TgtHeight;
   int Mid = TgtHeight >> 1;
   int E = 0;