[syzbot] [iomap?] [erofs?] WARNING in iomap_iter (4)

[syzbot]

Hello,

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

Reported-by: syzbot+6c0b301317aa0156f9eb at syzkaller.appspotmail.com
Tested-by: syzbot+6c0b301317aa0156f9eb at syzkaller.appspotmail.com

Tested on:

commit:         2795294b erofs: handle NONHEAD !delta[1] lclusters gra..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git dev-test
console output: https://syzkaller.appspot.com/x/log.txt?x=1058db5f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=921b01cbfd887a9b
dashboard link: https://syzkaller.appspot.com/bug?extid=6c0b301317aa0156f9eb
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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