dm raid: fix address sanitizer warning in raid_resume
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 v4.19.256 by commit 3bfdc95466f5be4d8d95db5a5b470d61641a7c24. For more details please see the references link.