dnssec-triggerd: Infinite loop in update_connection_zones

[Ian Turner]

Somehow dnssec-trigger 0.17+repack-2 is missing this upstream patch:
https://github.com/NLnetLabs/dnssec-trigger/commit/b27e4f606e529c26e38e0a4be2452715face6d9b

I'm at a loss to explain how or why because the changelog fix is there, but not the actual code fix.

I observed on my system dnssec-triggerd in an infinite loop with a stacktrace like so:
#3 0x000055b1be3905f9 in update_connection_zones (connections=0x7ffefb321360)
    at riggerd/svr.c:1002
#4 handle_update_all (json=<optimized out>) at riggerd/svr.c:817
#5 sslconn_command (sc=<optimized out>) at riggerd/svr.c:1303
#6 control_callback (c=<optimized out>, arg=<optimized out>,
    reply_info=<optimized out>, err=0) at riggerd/svr.c:480
#7 0x000055b1be390a4d in control_callback (c=<optimized out>, arg=<optimized out>,
    err=<optimized out>, reply_info=<optimized out>) at riggerd/svr.c:380
#8 0x000055b1be384a76 in handle_select (base=base@entry=0x55b1bef42320,
    wait=<optimized out>, wait@entry=0x7ffefb321600) at riggerd/mini_event.c:221
#9 0x000055b1be384cd3 in event_base_dispatch (base=0x55b1bef42320)
    at riggerd/mini_event.c:243
#10 0x000055b1be386e3c in comm_base_dispatch (b=<optimized out>)
    at riggerd/netevent.c:252
#11 0x000055b1be37ecf1 in do_main_work (verb=<optimized out>, nodaemonize=1,
    cfgfile=0x55b1be398788 "/etc/dnssec-trigger/dnssec-trigger.conf")
    at riggerd/riggerd.c:286

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: dnssec-trigger 0.17+repack-2
ProcVersionSignature: Ubuntu 5.3.0-46.38-generic 5.3.18
Uname: Linux 5.3.0-46-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.8
Architecture: amd64
CurrentDesktop: KDE
Date: Fri May 1 17:55:46 2020
SourcePackage: dnssec-trigger
UpgradeStatus: Upgraded to eoan on 2020-04-21 (10 days ago)