WARNING in idr_destroy

[syzbot]

Hello,

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

Reported-and-tested-by: syzbot+05835159fe322770fe3d at syzkaller.appspotmail.com

Tested on:

commit:         b1289238 drm/lease: fix WARNING in idr_destroy
git tree:       https://github.com/hqj/hqjagain_test.git idr_destroy
kernel config:  https://syzkaller.appspot.com/x/.config?x=cec95cb58b6f6294
dashboard link: https://syzkaller.appspot.com/bug?extid=05835159fe322770fe3d
compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

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