[Bug 253736] backlight(8) arg parsing can be tricked in a small way

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253736

            Bug ID: 253736
           Summary: backlight(8) arg parsing can be tricked in a small way
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: corvid at openmailbox.org

Incrementing or decrementing by 0 changes brightness by 10 instead.

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