virtio_vdpa: don't warn when fail to disable vq

There's no guarantee that the device can disable a specific virtqueue
through set_vq_ready(). One example is the modern virtio-pci
device. So this patch removes the warning.

Signed-off-by: Jason Wang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Michael S. Tsirkin <[e-mail]>

drivers/virtio/virtio_vdpa.c

···
 	list_del(&info->node);
 	spin_unlock_irqrestore(&vd_dev->lock, flags);
 
-	/* Select and deactivate the queue */
+	/* Select and deactivate the queue (best effort) */
 	ops->set_vq_ready(vdpa, index, 0);
-	WARN_ON(ops->get_vq_ready(vdpa, index));
 
 	vring_del_virtqueue(vq);