The overflow check for ref counting should not be subject to NDEBUG, hence upgrade assert() → assert_se(). (The check for zero is an immediate bug in our code, and should be impossible to trigger, hence it's fine if the check is optimized away if people are crazy enough to set NDEBUG, so that can stay assert()) https://github.com/systemd/systemd/pull/23099#discussion_r854341850
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