[syzbot] [dri?] divide error in drm_mode_convert_to_umode

[syzbot]

syzbot suspects this issue was fixed by commit:

commit 9398332f23fab10c5ec57c168b44e72997d6318e
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Fri Nov 29 04:26:28 2024 +0000

    drm/modes: Avoid divide by zero harder in drm_mode_vrefresh()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1296f8b0580000
start commit:   1c892cdd8fe0 Merge tag 'vfs-6.8-rc6.fixes' of git://git.ke..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=eff9f3183d0a20dd
dashboard link: https://syzkaller.appspot.com/bug?extid=0d7a3627fb6a42cf0863
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17f2fbc2180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=177bda8a180000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: drm/modes: Avoid divide by zero harder in drm_mode_vrefresh()

For information about bisection process see: https://goo.gl/tpsmEJ#bisection