virtio: console: Error out if we can't allocate buffers for control queue
With MULTIPORT support, the control queue is an integral part of the functioning of the device. If we can't get any buffers allocated, the host won't be able to relay important information and the device may not function as intended. Ensure 'probe' doesn't succeed until the control queue has at least one buffer allocated for its ivq. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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