fs: jfs: fix possible NULL pointer dereference in dbFree()
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 v4.19.247 by commit c381558c278a540c61dfef1f2b77ab817d5d302d. For more details please see the references link.