[InterNetNews/inn] f8ecbd: ctlinnd: fix feedinfo command for all sites

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: f8ecbd550958944fdf5c7264d6fcd0f46d3af12a
      https://github.com/InterNetNews/inn/commit/f8ecbd550958944fdf5c7264d6fcd0f46d3af12a
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2022-08-08 (Mon, 08 Aug 2022)

  Changed paths:
    M doc/pod/news.pod
    M innd/site.c

  Log Message:
  -----------
  ctlinnd: fix feedinfo command for all sites

ctlinnd feedinfo '' returned information only for the first site.  A spurious
"\0" was introduced after the generation of the information for each site.

close #237