reresend: wined3d NULL dereference patch

[Chris]

IDirect3DDevice8Impl_GetStreamSource calls IWineD3DDevice_GetStreamSource with 
an explicit pOffset pointer value of 0. IWineD3DDevice_GetStreamSource 
attempts to dereference and set pOffset without checking if it's NULL, which 
then leads to a crash (this happens, for example, when playing Morrowind with 
pixel shaders on, and going outside). This patch fixes that crash (though 
there's still other issues with the game and pixel shaders).

(resend at Alexandre's request)
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