s3:ctdbd_conn: fix ctdbd_public_ip_foreach() for ipv6 addresses

s3:ctdbd_conn: fix ctdbd_public_ip_foreach() for ipv6 addresses

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15534

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Thu Dec 21 11:09:30 UTC 2023 on atb-devel-224

(cherry picked from commit 828f3c99122fb033ecb79e24ed24821b8510f0f8)

Autobuild-User(v4-18-test): Jule Anger <janger@samba.org>
Autobuild-Date(v4-18-test): Thu Dec 28 17:09:25 UTC 2023 on atb-devel-224