fs: fix UAF/GPF bug in nilfs_mdt_destroy
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 c0aa76b0f17f59dd9c9d3463550a2986a1d592e4. For more details please see the references link.