drm_err meant broken user space could spam dmesg.

Fixes: f258907f "drm/amdgpu: Verify bo size can fit framebuffer size on init."
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NMichel Dänzer <mdaenzer@redhat.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>