GSD-2022-1005024 xen/privcmd: fix error exit of privcmd_ioctl_dm_op()

xen/privcmd: fix error exit of privcmdioctldmop 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 v5.19.6 by commit...