rpcrt4: Unmarshal NULL OLE interfaces properly by handling the case of a 0 stream size.

[Robert Shearman]

---
  dlls/rpcrt4/ndr_ole.c |   10 ++++++----
  1 files changed, 6 insertions(+), 4 deletions(-)

Fixes an ole err that appears during unmarshaling of a NULL interface in 
the DreamWeaver 8 demo installer, but doesn't seem to change the 
behaviour at all.
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