inbox: keep DB handles if git processes are live

Having git processes outlive DB handles is likely to hurt
from a fragmentation perspective if the DB handle needs to
be recreated immediately due to a git->cat_async callback.
So only unref DB handles when we're sure there's no live
git users left, otherwise check the inodes.

We'll also avoid needless localization checks in git->cleanup
and make the return value more obvious since the pid fields are
unconditionally deleted nowadays.

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