[InterNetNews/inn] 4f1bee: Scan every buffindexed slot during hidden expiry

[Kevin Bowling]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 4f1beea197659aa25da19766267d5e825c7ad154
      https://github.com/InterNetNews/inn/commit/4f1beea197659aa25da19766267d5e825c7ad154
  Author: Kevin Bowling <kevin.bowling at kev009.com>
  Date:   2026-08-13 (Thu, 13 Aug 2026)

  Changed paths:
    M storage/buffindexed/buffindexed.c

  Log Message:
  -----------
  Scan every buffindexed slot during hidden expiry

A full freelist is represented by -1, so using the freelist head as the
loop bound skipped hidden-group expiry once all mapped slots had been
allocated. Refresh the mapping and scan every slot, relying on the zero
count of unused entries to skip them.

see #372



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