Re: [PATCH] commit-graph: retain commit slab when closing NULL commit_graph

> This fixes a regression introduced in ac6d45d11f (commit-graph: move
> slab-clearing to close_commit_graph(), 2023-10-03), in which running:
> ...
> So it happens to work out. But it still seems questionable to me that we
> would clear a global slab (which might still be in use) when closing the
> commit graph. This clearing comes from 957ba814bf (commit-graph: when
> closing the graph, also release the slab, 2021-09-08), and was fixing a
> case where we really did need it to be closed (and in that case we
> presumably call close_object_store() more directly).