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 v5.4.198 by commit e54fd01178ebd5b13ef9e2fc0f3006765f37ee3c. For more details please see the references link.