[Swan-commit] Changes to ref refs/heads/master

[D. Hugh Redelmeier]

New commits:
commit 6cbfd86ed15e64bef8642133658dc89b95f9038e
Author: D. Hugh Redelmeier <hugh at mimosa.com>
Date:   Fri Sep 1 14:40:53 2017 -0400

    pluto: test for NULL explicitly