rpcrt4: Don't copy memory from the buffer in NdrConformantStringUnmarshall if we just pointed the memory pointer into the buffer.

[Robert Shearman]

(Reported by Dan Kegel.)
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  dlls/rpcrt4/ndr_marshall.c |    3 ++-
  1 files changed, 2 insertions(+), 1 deletions(-)
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