GSD-2022-1000871 xen/xenbus: don't let xenbus_grant_ring() remove grants in error case

xen/xenbus: don't let xenbusgrantring remove grants in error case 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 v5.4.184 by commit...