rpcrt4: Only initialise the context handle to NULL in NdrContextHandleUnmarshall if it is an out-only or return one.

[Robert Shearman]

Fix the indentation and add tracing of the context handle flags.
---
  dlls/rpcrt4/ndr_marshall.c |   13 ++++++++++---
  1 files changed, 10 insertions(+), 3 deletions(-)
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