There is no such loglevel 'critical', only 'crit' is defined.
For some reason this issue has not been spotted until the upgrade to
Buildroot 2025.02, which includes sysklogd v2.7.0, and Finit v4.11.
Introduced in 3e48af6, when the concept of failure-config was added.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>