I've got a bunch of nits; the only two blockers for me here are the
version number and changelog entry. Thanks for the work!

Impact: +1

Test plan: The affected code is run by `kcm_process_init` before the
responder drops into its main loop so this codepath is exercised by the
test plan. I'm assuming that the expected behavior for the fixed package
is for the responder to start and drop into its main loop (wait
forever). It would be nice to include a description of what we're
expecting to see from the fixed package.

Where problems could occur: The regression you describe here is IMO
better than the use-after-free, but could be an unpleasant surprise for
a user. What might a user affected by this case have to do to
troubleshoot and/or resolve the problem? (edit the config file?)

Code change: trivial, LGTM

Patch/DEP-3: I try to use the LP bug's short form for Bug-Ubuntu:
https://bugs.launchpad.net/bugs/2169162.

Changelog:
- As Seyeong requested, can you propose a version number for the upload? (docs 
at [1])
- How could a user who isn't a C programmer evaluate whether they want to 
install this update? What is the impact of the use-after-free? The patch 
description tells us what changed, the changelog entry should tell us why.
- You don't need to include [ Maizi Liao ] over your entry when you're the only 
one making changes
- This is completely optional, but I like to use the top-level bullet of the 
changelog for my short description & LP bug reference and then list the patches 
as sub-bullets (as you did in your lldpd uploads [2])

[1] https://ubuntu.com/project/docs/how-ubuntu-is-made/concepts/version-strings/
[2] https://launchpad.net/ubuntu/+source/lldpd/1.0.18-1ubuntu0.1

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https://bugs.launchpad.net/bugs/2169162

Title:
  sssd-kcm fails to start due to use-after-free with krb5_renew_interval

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