dm raid: fix KASAN warning in raid5adddisks
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 v5.10.129 by commit d8bca518d5272fe349e0a722fdb9e3acb661f3f0. For more details please see the references link.