[NDR] Fix Accessing Arguments in NdrClientCall2

[Robert Shearman]

ChangeLog:
Add a macro for accessing arguments by offset.

Fix another unnecessary negation.

Fix a crash when using NdrClientCall2 in object mode because of
accessing the arguments incorrectly and incorrectly advancing the
pointer.

   dlls/rpcrt4/ndr_stubless.c |   36 +++++++++++++++++-------------------
   1 files changed, 17 insertions(+), 19 deletions(-)


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