collectd: ping - fix use-after-free when re-resolving a host

collectd: ping - fix use-after-free when re-resolving a host

Add a patch fixing a possible crash, when a non-responding host is
tried to be pinged and retry attempts are limited by MaxMissed option.

> daemon.err: collectd[14133]: ping plugin: host 192.168.1.99 has not answered 3 PING requests, triggering resolve
> daemon.info: procd: Instance collectd::instance1 s in a crash loop 7 crashes, 3 seconds since last crash

Fixes: #29649
* upstream bug created: https://github.com/collectd/collectd/issues/4406
* older upstream bug: https://github.com/collectd/collectd/issues/3079

Signed-off-by: Hannu Nyman <redacted>