oleaut32: Initialise BSTR pointer to NULL in VARIANT_UserUnmarshal

[Robert Shearman]

ChangeLog:
Initialise BSTR pointer to NULL before calling BSTR_UserUnmarshal,
otherwise BSTR_UserUnmarshal will try to use the memory in the pointer.

  dlls/oleaut32/usrmarshal.c |    3 ++-
  1 files changed, 2 insertions(+), 1 deletions(-)

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