[syzbot] [fs?] WARNING in nsproxy_ns_active_put

[syzbot]

Hello,

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

Reported-by: syzbot+0b2e79f91ff6579bfa5b at syzkaller.appspotmail.com
Tested-by: syzbot+0b2e79f91ff6579bfa5b at syzkaller.appspotmail.com

Tested on:

commit:         d2bab7f2 nsproxy: fix free_nsproxy() and simplify crea..
git tree:       https://github.com/brauner/linux.git namespace-6.19
console output: https://syzkaller.appspot.com/x/log.txt?x=123a8658580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=59952e73920025e4
dashboard link: https://syzkaller.appspot.com/bug?extid=0b2e79f91ff6579bfa5b
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.