[InterNetNews/inn] 31e64a: innd: Skip closing an already closed site

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 31e64a5d5ea9b498c007bd4d05db2c5328c0cc5e
      https://github.com/InterNetNews/inn/commit/31e64a5d5ea9b498c007bd4d05db2c5328c0cc5e
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2023-12-09 (Sat, 09 Dec 2023)

  Changed paths:
    M innd/site.c

  Log Message:
  -----------
  innd: Skip closing an already closed site

A useless notice log is otherwise written (notably seen
when using ctlinnd hangup).