Syzbot report a task hung in vcs_open.
When rec_len too small in nilfs_check_folio, it can result in a huge flood
of messages being sent to the console. It eventually caused tty to hung when
retrieving the console_lock().
Reported-by: syzbot+8a192e8d090fa9a31135@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=8a192e8d090fa9a31135
Signed-off-by: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx>