drm/virtio: fix command submission with objects but without fence.
Only call virtio_gpu_array_add_fence if we actually have a fence. Fixes: da758d51 ("drm/virtio: rework virtio_gpu_execbuffer_ioctl fencing") Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Reviewed-by: NChia-I Wu <olvaffe@gmail.com> Link: http://patchwork.freedesktop.org/patch/msgid/20190904074828.32502-1-kraxel@redhat.com
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