powerpc/secvar: fix refcount leak in format_show()
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 v5.16.20 by commit c105ffb6b9744158e37e9f81f0f38861951d1c1f. For more details please see the references link.