powerpc/xics: fix refcount leak in icpopalinit()
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 df802880a7f9cd96b921b00639b00871f18a9a57. For more details please see the references link.