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

[Stefan Dösinger]

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Am 2014-08-18 09:43, schrieb Michael Stefaniuc:
>> So I guess it means test is incorrect, and implementation too.
> Correct. One of my scripts has detected the comparison to self. I
> pinged Stefan and he wanted to look at it but seems that it got 
> forgotten. There might be even emails on wine-devel about this >1
> year ago.
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.

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