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 v4.9.334 by commit ccb22c876e8e7f62377e749c971907efe65d34c2, it was introduced in version v3.6 by commit f65c9bb3fb725551d3e405f4d092caf24929cebe. For more details please see the references link.