nilfs2: fix use-after-free bug of ns_writer on remount
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 v4.19.267 by commit b4736ab5542112fe0a40f140a0a0b072954f34da. For more details please see the references link.