ddraw: Fix Setmaterial with a test

[David Adam]

> David Adam wrote:
> > - The test succeded in my windows XP box.

*>>*
*>You have only ddraw test and no d3d test.
> Vitaliy.

Giving a NULL value to SetMaterial in d3d9 or d3d8 makes Windows crashes.
It is a forbidden value (see bug 13646). So, no test can be performed
for d3d8 and d3d9.

I sent a patch to removed these test earlier.

David