ddraw: Fix SetMaterial (RESEND)

[David Adam]

These two following patches fix bug 13646.
Only ddraw checks for a null entry in SetMaterial (see the discussion in
wine-devel).
Natively, d3d9 and d3d8 crash in SetMaterial when a null pointer is given.
To match the native behaviour of windows, wine must crash when calling
SetMaterial in d3d8 or d3d9 with a null pointer.
So, one must remove the tests in d3d9 and d3d8
 to avoid to make wine crashed.

David
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