Re: [PATCH 01/17] refs/files: simplify iterating through root refs

> When iterating through root refs we first need to determine the
> directory in which the refs live. This is done by retrieving the root of
> the loose refs via `refs->loose->root->name`, and putting it through
> `files_ref_path()` to derive the final path.
> 
> This is somewhat redundant though: the root name of the loose files
> cache is always going to be the empty string. As such, we always end up
> passing that empty string to `files_ref_path()` as the ref hierarchy we
> want to start. And this actually makes sense: `files_ref_path()` already
> computes the location of the root directory, so of course we need to
> pass the empty string for the ref hierarchy itself. So going via the
> loose ref cache to figure out that the root of a ref hierarchy is empty
> is only causing confusion.