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

[Andrew Cagney]

New commits:
commit 1add07818ae65f053ee169f744f1c924a1c720cd
Author: Andrew Cagney <cagney at gnu.org>
Date:   Thu Jan 21 09:30:39 2021 -0500

    ip: return true for address_is_unset(NULL) et.al.
    
    rather than dump core
    
    so that address_is_unset(NULL) and address_is_unset(&unset_address)
    are interchangable