drm: Prevent drmcopyfield() to attempt copying a NULL pointer
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 8052612b9d08048ebbebcb572894670b4ac07d2f. For more details please see the references link.