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

[Andrew Cagney]

New commits:
commit 1c8e213f19ea7ded957f6fb9634e1bc89ffb6f9f
Author: Andrew Cagney <cagney at gnu.org>
Date:   Mon Aug 12 12:48:54 2019 -0400

    ip: eliminate address_is_valid() et.al. instead use address_type() != NULL
    
    Seeing as an address with no type isn't exactly valid.