blocklist-helper: Silence a bogus pf warning
Silence a bogus warning about (an ethernet) anchor not being found.
It has been reported as PR 280516. In the meantime, just sweep under
the carpet.
Approved by: emaste (mentor)
MFC after: 2 days
(cherry picked from commit 2347ca21d657121670e6e7246c6ac32efc996cac)