Re: [PATCH 7/9] update-ref: move transaction handling into `update_refs_stdin()`

Patrick Steinhardt [off-list ref] writes:

While the actual logic to update the transaction is handled in
`update_refs_stdin()`, the transaction itself is started and committed
in `cmd_update_ref()` itself. This makes it hard to handle transaction
abortion and commits as part of `update_refs_stdin()` itself, ...

It is not offhand clear why it makes any difference, especially
because there is only a single caller of update_refs_stdin()
function, but let's see how this move makes things easier in [8/9]
and [9/9].

The patch itself looks like a bug-free no-op change.

Thanks.