upstream: make ssh_free(NULL) a no-op

OpenBSD-Commit-ID: 42cb285d94789cefe6608db89c63040ab0a80fa0
This commit is contained in:
djm@openbsd.org 2020-12-04 02:29:56 +00:00 committed by Damien Miller
parent 3b98b6e27f
commit ace12dc64f