jfs: fix GPF in diFree
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 v5.4.133 by commit a21e5cb1a64c904f1f0ef7b2d386fc7d2b1d2ce2. For more details please see the references link.