Fix potential NULL deref in IWineD3DSurfaceImpl_LockRect

[Chris]

On Monday 10 July 2006 09:43, you wrote:
> I can't find this patch anywhere via google and I don't have it in my mails
> here, so I can't comment on the patch directly, but from your description
> I'd say that the NULL deref was introduced by a patch of mine(the one which
> enabled single buffering). Can you mail me the patch?

Sure. Patch attached..
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