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 v5.10.111 by commit 02222bf4f0a27f6eba66d1f597cdb5daadd51829. For more details please see the references link.