Re: [PATCH 8/8] submodule: fix bug and remove add_submodule_odb()

> I would write the commit message like this:
>
>   submodule: fix latent check_has_commit() bug
>
>   check_has_commit() will attempt to clear a non-initialized struct
>   repository if initialization fails. This bug is masked by its only
>   caller, submodule_has_commits(), first calling add_submodule_odb().
>   The latter fails if the repo does not exist, making
>   submodule_has_commits() exit early and not invoke check_has_commit()
>   in a situation in which initialization would fail.
>
>   Fix this bug, and because calling add_submodule_odb() is no longer
>   necessary as of 13a2f620b2 (submodule: pass repo to
>   check_has_commit(), 2021-10-08), remove that call too.
>
>   This is the last caller of add_submodule_odb(), so remove that
>   function. (Adding submodule ODBs as alternates is still present in the
>   form of add_submodule_odb_by_path().)