[PATCH] d3dx9_36: ID3DXEffectImpl_Begin should succeed even if we don't care

[Rafał Mużyło]

Caller of ID3DXEffectImpl_Begin might not care how many passes it takes.
Call shouldn't fail in such case.

Signed-off-by: Rafał Mużyło <galtgendo(a)o2.pl>