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 v5.17.3 by commit d05e4265d33af60b39606c20c731e3e719bfe3d6. For more details please see the references link.