Remove useless NULL check.
Remove useless NULL check.

Coverity analysis proves that a nul nc_protofamily must cause a
crash.  In this case, it seems best to take it as an invariant.

Coverity CID 30258.

Signed-off-by: Matt Benjamin <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@linuxbox.com>

sswen/ntirpc,sswen/ntirpc