widl: Raise RPC_X_SS_IN_NULL_CONTEXT exception for NULL in-only context handles instead of RPC_X_NULL_REF_PTR.

[Rob Shearman]

Based on a patch by Michael Martin.
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 tools/widl/client.c |    8 ++++++++
 tools/widl/proxy.c  |    5 +++++
 2 files changed, 13 insertions(+), 0 deletions(-)
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