GSD-2022-1007670 xen/gntdev: Prevent leaking grants

xen/gntdev: Prevent leaking grants 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 v4.9.332 by commit b043f2cab100bed3e0a999dcf38cc05b1e4a7e41, ...