virtio-gpu: fix output lookup
Needed for multihead setups where we can have disabled
outputs and therefore plane->crtc can be NULL.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Needed for multihead setups where we can have disabled
outputs and therefore plane->crtc can be NULL.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>