[PATCH 0/2] bug with rev-list --verify-objects and commit-graph

While looking at something unrelated, I noticed that "git rev-list --verify-objects" will not actually notice corruptions of commits that are found in a commit graph. This fixes it.

The first one is a cleanup that is not strictly related, but is needed for the tests in the second to work reliably (and is a good idea anyway).

The second is the fix. I don't think it's super-important, as we do not use --verify-objects for anything, since d21c463d55 (fetch/receive: remove over-pessimistic connectivity check, 2012-03-15). And it's not even documented, so perhaps we should just consider getting rid of it. But in the meantime, it was easy enough to correct.

  [1/2]: lookup_commit_in_graph(): use prepare_commit_graph() to check for graph
  [2/2]: rev-list: disable commit graph with --verify-objects

 commit-graph.c  |  2 +-
 revision.c      |  1 +
 t/t1450-fsck.sh | 28 ++++++++++++++++++++++++++++
 3 files changed, 30 insertions(+), 1 deletion(-)

-Peff