Add a test to make sure that the linter fails correctly. Signed-off-by: Martin Roth <gaumless@gmail.com> Change-Id: I971951d4248dd10abe4c622025fdaf86e014c6cc Reviewed-on: https://review.coreboot.org/c/coreboot/+/67351 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Elyes Haouas <ehaouas@noos.fr>