Re: [PATCH 08/10] fast-export: add a "data" callback parameter to anonymize_str()

> The anonymize_str() function takes a generator callback, but there's no
> way to pass extra context to it. Let's add the usual "void *data"
> parameter to the generator interface and pass it along.
>
> This is mildly annoying for existing callers, all of which pass NULL,
> but is necessary to avoid extra globals in some cases we'll add in a
> subsequent patch.

> While we're touching each of these callbacks, we can further observe
> that none of them use the existing orig/len parameters at all. This
> makes sense, since the point is for their output to have no discernable
> basis in the original (my original version had some notion that we might
> use a one-way function to obfuscate the names, but it was never
> implemented). So let's drop those extra parameters. If a caller really
> wants to do something with them, it can pass a struct through the new
> data parameter.