bug#52539: Fwd: Comments in /etc/passwd don't get updated

[Ludovic Courtès]

> I clarified this and ensures ‘chfn’ is actually usable in commit
> c76775263e56a10cc1b84d03a5827f42436afe40.

Oops, I hadn’t pushed; the right commit ID is
671e6a81804f264ddcdd6fe7579644404da079b8.

Ludo’.