nilfs2: fix use-after-free bug of struct nilfs_root
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.14.296 by commit 26b9b66610d6f8f3333cb6f52e97745da875fee1. For more details please see the references link.