xen/pcpu: fix possible memory leak in register_pcpu()
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 v5.4.225 by commit 0199bf0a8f74509736744c9e36f4473a5892a09d, it was introduced in version v3.6 by commit f65c9bb3fb725551d3e405f4d092caf24929cebe. For more details please see the references link.