dm raid: fix KASAN warning in raid5_add_disks
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 v5.15.53 by commit d5b06039b195d4b6f94f5d345b1e4ac1975a9832. For more details please see the references link.