rpcrt4: Set the fBufferValid flag in NdrProxyGetBuffer.

[Robert Shearman]

Only call IRpcChannelBuffer_FreeBuffer in NdrProxyFreeBuffer if 
fBufferValid is set.
---
  dlls/rpcrt4/cproxy.c |   12 ++++++++----
  1 files changed, 8 insertions(+), 4 deletions(-)
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