rpcrt4: Don't call IUnknown_AddRef if there is no outer unknown

[Robert Shearman]

ChangeLog:
Don't call IUnknown_AddRef if there is no outer unknown in
StdProxy_Construct as it will just crash anyway.

  dlls/rpcrt4/cproxy.c |    6 +++++-
  1 files changed, 5 insertions(+), 1 deletions(-)

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