oleaut32: Correctly marshal NULL interface ptrs.

[Huw Davies]

---
 dlls/oleaut32/tests/usrmarshal.c |   24 ++++++++++++++++++++++
 dlls/oleaut32/usrmarshal.c       |   41 +++++++++++++++++++++++++-------------
 2 files changed, 51 insertions(+), 14 deletions(-)
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