WINED3D: Fix a possible null dereference.

[David Adam]

The Sting Demo calls the function IDirect3DDeviceImpl_7_SetMaterial (in
ddraw/device.c) with Mat=NULL.
Then, this makes the function IWineD3DDeviceImpl_SetMaterial (in
wined3d/device.c) crashes in the line  This->updateStateBlock->material =
*pMaterial;
So, the patch checks is the material is not null before  assignating it.

This fixes a crash in The Sting demo.

David Adam
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