md: Replace snprintf with scnprintf
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 v4.19.262 by commit 897b1450abe5a67c842a5d24173ce4449ccdfa94, it was introduced in version v4.10 by commit 766038846e875740cf4c20dfc5d5b292ba47360a. For more details please see the references link.