[InterNetNews/inn] 71d593: Trim whitespace without pre-start pointers

[Kevin Bowling]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 71d593325ef27be72507466a2e15b823b937e521
      https://github.com/InterNetNews/inn/commit/71d593325ef27be72507466a2e15b823b937e521
  Author: Kevin Bowling <kevin.bowling at kev009.com>
  Date:   2026-08-04 (Tue, 04 Aug 2026)

  Changed paths:
    M backends/actsync.c
    M innfeed/misc.c

  Log Message:
  -----------
  Trim whitespace without pre-start pointers

Walk backward from the string terminator while checking the lower bound
before dereferencing.  Empty and all-whitespace input no longer forms
or compares a pointer before the array.

see #371



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