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Notify users that upgrading from -CURRENT or -STABLE is unsupported by freebsd-update. Also ensure --currently-running provides a correctly formatted release (as done by -r). PR: 234771 Submitted by: Gerald Aryeetey <aryeeteygerald_rogers.com> Reported by: yuri Reviewed by: bcran MFC after: 1 month Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D18803