[dx52] fix AddDirtyRect

Roderick Colenbrander thunderbird2k at gmx.net
Fri Jun 6 11:56:39 CDT 2003

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.

Roderick Colenbrander
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