rpcrt4: Fix a case of destroying a context handle without first releasing the lock.

[Robert Shearman]

Reverse the order of the release statements in NDRSContextMarshall2 for 
the case where the context handle doesn't have valid data so that the 
release that releases the lock comes first and then the optional second 
release doesn't need to release the lock.
---
  dlls/rpcrt4/ndr_contexthandle.c |   10 +++++++---
  1 files changed, 7 insertions(+), 3 deletions(-)
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