client: warning about cgroup cleanup with nil error

[shoenig]

Noticed these warnings while messing with a poststart task using the podman driver. Haven't looked into it but it's odd we're emitting a warning with a nil error.

2023-06-16T16:32:14.014Z [WARN]  client.alloc_runner.task_runner.task_hook.logmon.nomad: timed out waiting for read-side of process output pipe to close: alloc_id=43a30474-a06d-2453-203c-5ac3fe73ec45 task=registry @module=logmon timestamp=2023-06-16T16:32:14.014Z
2023-06-16T16:32:14.058Z [WARN]  client.cpuset.v2: failed to cleanup cgroup: path=/sys/fs/cgroup/nomad.slice/libpod-0ff072e692c2a51358e589ce47f11c64e432fc15255694be5d127e692c4cd0d0.scope error=<nil>

[shoenig]

Should be fixed as part of #18371

[github-actions]

I'm going to lock this issue because it has been closed for 120 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.