[InterNetNews/inn] 5475f0: Give inherited canlock settings independent storage

[Kevin Bowling]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 5475f0917f531622d917ed67d1e0f0b18b82b47a
      https://github.com/InterNetNews/inn/commit/5475f0917f531622d917ed67d1e0f0b18b82b47a
  Author: Kevin Bowling <kevin.bowling at kev009.com>
  Date:   2026-07-31 (Fri, 31 Jul 2026)

  Changed paths:
    M nnrpd/perm.c

  Log Message:
  -----------
  Give inherited canlock settings independent storage

Deep-copy addcanlockuser along with the other access-group strings and
release it during teardown.  Overriding an inherited setting can no
longer free storage still owned by another group.

see #370



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