rpcrt4: Move the setting of retval_ptr outside of any particular stub phase in stub_do_args and stub_do_old_args.

[Robert Shearman]

After the change in order of phases it was no longer being set in the 
last phase and so caused all stubless functions to appear to have no 
return value.
---
  dlls/rpcrt4/ndr_stubless.c |   21 +++++++++++----------
  1 files changed, 11 insertions(+), 10 deletions(-)
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