fs: jfs: fix possible NULL pointer dereference in dbFree()

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 v5.15.46 by commit 4b9380d92c66cdc66987f65130789abad5c1af6f. For more details please see the references link.