ddraw/tests: Correct test condition (PVS-Studio)

[Stefan Dösinger]

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Am 2014-08-18 14:37, schrieb Stefan Dösinger:
> I remember that there was an application (Anarchy Online if my
> memory serves me right) that detected if a surface was locked by
> calling GetSurfaceDesc and checking if lpSurface was NULL. I'll do
> some testing on real HW and different IDirectDrawSurface versions.
The app in question was Dungeon Keeper 2:
https://www.winehq.org/pipermail/wine-patches/2007-May/039168.html

Testing on my AMD Radeon HD 5770 confirms the findings from the VM:
GetSurfaceDesc returns lpSurface == NULL. IDirectDrawSurface7 behaves
in the same way.
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