l2md: warn when revwalk did not succeed in prep step

If we couldn't even start walking the repo, throw a warning to
inform what went wrong. Now that we've bumped the open file limit
this issue should be mitigated, but this indicates that potentially
the repo needs a repack. Once libgit2 supports this, we can actually
do it here instead.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
1 file changed