[ddraw] Fix bug 3487 take 2

[Raphael]

>
> PS: and Raphael's patch while not fixing your bug is not technically wrong
>     as Windows checks for the surface description pointer being non-NULL
> :-)

I was trying to reproduce his bug but i always crashed on function with a null 
description :(
Seem you are more "rapide" than me 

Regards,
Raphael
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