drm/virtio: fix NULL pointer dereference in virtiogpuconngetmodes
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 v4.14.283 by commit 848dd072744ea662ab3097e3c8282bee552df218. For more details please see the references link.