[Bug 289812] Make frsig field optional in VT_SETMODE.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289812

--- Comment #9 from commit-hook@FreeBSD.org ---
A commit in branch stable/15 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=224d65015465d085f2e07edccef1f23a8c217b88

commit 224d65015465d085f2e07edccef1f23a8c217b88
Author:     Ed Maste <emaste@FreeBSD.org>
AuthorDate: 2025-09-30 19:39:34 +0000
Commit:     Ed Maste <emaste@FreeBSD.org>
CommitDate: 2025-12-09 16:32:10 +0000

    vt: Allow VT_SETMODE with frsig=0

    Linux does not check that any of the signals in vt_mode VT_SETMODE ioctl
    (relsig, acqsig, frsig) are valid, but FreeBSD required that all three
    are valid.  frsig is unusued in both Linux and FreeBSD, and software
    typically leaves it unset.  To improve portability, allow frsig to be
    set to zero.

    PR:             289812
    Reported by:    Dušan Gvozdenović
    Sponsored by:   The FreeBSD Foundation
    Differential Revision: https://reviews.freebsd.org/D52835

    (cherry picked from commit 5198c32210039d8dc92554647384eee75688848c)

 sys/dev/vt/vt_core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

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