wined3d/d3d9: Pitch for DXTn textures can not be 0. With tests.

[Vitaliy Margolen]

Returning 0 pitch caused broken textures and crash in few programs I'm debugging.
It can be also a reason for "white" or "corrupted" textures for high MIP levels.
---
 dlls/d3d9/tests/surface.c |   30 ++++++++++++++++++++++++++++++
 dlls/wined3d/surface.c    |    4 ++--
 2 files changed, 32 insertions(+), 2 deletions(-)
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