Fix pointer sign warnings in auth.h
Fix pointer sign warnings in auth.h

Signed-off-by: Adam C. Emerson <5b31e678c63efb16971de48326ea242637553588@linuxbox.com>
Signed-off-by: Matt Benjamin <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@linuxbox.com>

sswen/ntirpc,sswen/ntirpc