ddraw: Use proper helpers for iface calls

[Jacek Caban]

---
 dlls/ddraw/material.c     |    2 +-
 dlls/ddraw/surface.c      |   20 ++++++++++----------
 dlls/ddraw/vertexbuffer.c |    6 +++---
 3 files changed, 14 insertions(+), 14 deletions(-)


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