remote: warning: ignoring extra bitmap file when pulling from a deduplicated repo

Seen today on the gitlab-org/gitlab-pages repository:

$ git fetch upstream master
remote: warning: ignoring extra bitmap file: /var/opt/gitlab/git-data/repositories/@pools/81/17/811786ad1ae74adfdd20dd0372abaaebc6246e343aebd01da0bfc4c02bf0106c.git/objects/pack/pack-1d59d5e04b0538cfc7fb23125f81c317aafd0b10.pack

I think we try to avoid displaying server-side paths to the client in other cases. Other than that, it didn't seem to affect anything - the fetch succeeded and had all the objects I expected.