[dx52] fix AddDirtyRect

[Roderick Colenbrander <thunderbird2k@gmx.net>]

Hi all,

This patch fixes a problem that appeared in Mafia. Before this function 
crashed when pDirtyRect was null. According to MSDN D3DERR_INVALIDCALL should 
be returned in case of problems.

Regards,
Roderick Colenbrander

Index: dlls/d3d8/surface.c
===================================================================
RCS file: /home/wine/wine/dlls/d3d8/surface.c,v
retrieving revision 1.15
diff -u -r1.15 surface.c
--- dlls/d3d8/surface.c	4 Jun 2003 23:05:46 -0000	1.15
+++ dlls/d3d8/surface.c	6 Jun 2003 16:48:56 -0000
@@ -603,6 +603,10 @@
  */
 extern HRESULT WINAPI IDirect3DSurface8Impl_AddDirtyRect(LPDIRECT3DSURFACE8 iface, CONST RECT* pDirtyRect) {
   ICOM_THIS(IDirect3DSurface8Impl,iface);
+
+  if(pDirtyRect == NULL)
+	return D3DERR_INVALIDCALL;
+
   This->Dirty = TRUE;
   This->dirtyRect.left   = min(This->dirtyRect.left,   pDirtyRect->left);
   This->dirtyRect.top    = min(This->dirtyRect.top,    pDirtyRect->top);