Spotted by Coverity.

Also adds a test for ddraw, d3d8 and d3d9.

D3DTEXF_NONE is a special value for mipmapping which disabled
mipmapping, but it is not a valid mag / min filter parameter.
D3DTEXF_POINT is what we want

Fix SetupQueryInfOriginalFileInformation to check for the former rather than the latter.

unloadVertexData() will already have done this if necessary.