vgaarb: Stop complaining about absent devices
Some setups do not register a default VGA device, in which case the VGA arbiter will still complain about the (non-existent) PCI device being a non-VGA device. Fix this by making the error message conditional on a default VGA device having been set up. Note that the easy route of erroring out early isn't going to work because otherwise priv->target won't be properly updated. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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