vt_ioctl: fix array_index_nospec in vt_setactivate
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 v5.10.101 by commit 778302ca09498b448620edd372dc908bebf80bdf. For more details please see the references link.