util/lint: Fix clang-format test and enable it by default

git diff needed to emit diffs without prefix (e.g. a/ and b/) for
clang-format-diff to be able to work.

Also require that the test succeeds, but note that it only runs on
trees whitelisted in $(top)/.clang-format-scope.

Change-Id: I7e9a32eb9281b5cb0b45506a206500fd1d315372
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31654
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

0 files changed, 0 insertions, 0 deletions