ole32: Fix DefaultHandler_EnumAdvises

[Robert Shearman]

ChangeLog:
As per MSDN, if the object has no connections then
IOleObject::EnumAdvises should return a NULL enumerator and S_OK. This
is the case when This->oleAdviseHolder is NULL, so do this and avert a
potential NULL dereference of This->oleAdviseHolder. (Found by
Coverity.)

  dlls/ole32/defaulthandler.c |    5 ++---
  1 files changed, 2 insertions(+), 3 deletions(-)

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