if guest driver failed to enter full GPU access, amdgpu_driver_load_kms
will unload kms and free dev->dev_private, drm_dev_register would access
null pointer. Driver will enter an error state and can't be unloaded.
Signed-off-by: NLiu ChengZhe <ChengZhe.Liu@amd.com>
Reviewed-by: NMadhav Chauhan <madhav.chauhan@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>