Re: [PATCH 20/21] builtin/merge: release outbut buffer after performing merge

> The `obuf` member of `struct merge_options` is used to buffer output in
> some cases. In order to not discard its allocated memory we only release
> its contents in `merge_finalize()` when we're not currently recursing
> into a subtree.
>
> This results in some situations where we seemingly do not release the
> buffer reliably. We thus have calls to `strbuf_release()` for this
> buffer scattered across the codebase. But we're missing one callsite in
> git-merge(1), which causes a memory leak.
>
> We should ideally refactor this interface so that callers don't have to
> know about any such internals. But for now, paper over the issue by
> adding one more `strbuf_release()` call.