[syzbot] [afs?] general protection fault in afs_atcell_get_link

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+76a6f18e3af82e84f264 at syzkaller.appspotmail.com
Tested-by: syzbot+76a6f18e3af82e84f264 at syzkaller.appspotmail.com

Tested on:

commit:         76b6905c Merge tag 'mm-hotfixes-stable-2025-03-17-20-0..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=164d45e4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2e330e9768b5b8ff
dashboard link: https://syzkaller.appspot.com/bug?extid=76a6f18e3af82e84f264
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1184f278580000

Note: testing is done by a robot and is best-effort only.