[Bug 279200] sysrc(8) fails to perform set operations for += and -= in -c (check only) mode.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279200

--- Comment #3 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=c97460c4d97db1bd46dab9f2bdbc90cd1ed7757f

commit c97460c4d97db1bd46dab9f2bdbc90cd1ed7757f
Author:     Michal Scigocki <michal.os@hotmail.com>
AuthorDate: 2025-04-14 07:01:06 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2025-04-28 18:18:08 +0000

    sysrc: Fix check flag logic for append and subtract

    When using sysrc with the check flag (-c), the append (+=) and subtract
    (-=) operations result in incorrect return values because on the check
    path the necessary union/difference calculation logic is not performed.

    However, the correct union/difference calculation is already performed
    when running without the check flag. We fix the issue on the check path
    by using the results from the existing union/difference calculation in
    the check logic to get the correct return values.

    PR:             279200
    Reviewed by:    markj
    MFC after:      1 month
    Pull Request:   https://github.com/freebsd/freebsd-src/pull/1664

 usr.sbin/sysrc/sysrc | 52 +++++++++++++++++++++++++---------------------------
 1 file changed, 25 insertions(+), 27 deletions(-)

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