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 v5.4.220 by commit cdde55f97298e5bb9af6d41c9303a3ec545a370e. For more details please see the references link.