st/nine: Fix D3DFMT_NULL size
st/nine: Fix D3DFMT_NULL size

D3DFMT_NULL is mapped to PIPE_FORMAT_NONE.
Instead of relying on PIPE_FORMAT_NONE to
return a size, pick one.
The one picked is the same than Wine.

Signed-off-by: Axel Davy <2b6ef604b998fb81662f85c329e4fc020eae8e5d@ens.fr>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler