virtio_console: fix uninitialized variable use

We try to disable callbacks on c_ivq even without multiport
even though that vq is not initialized in this configuration.

Fixes: c743d09d ("virtio: console: Disable callbacks for virtqueues at start of S4 freeze")
Suggested-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/char/virtio_console.c

@@ -2202,6 +2202,7 @@ static int virtcons_freeze(struct virtio_device *vdev)
 
 	vdev->config->reset(vdev);
 
+	if (use_multiport(portdev))
 		virtqueue_disable_cb(portdev->c_ivq);
 	cancel_work_sync(&portdev->control_work);
 	cancel_work_sync(&portdev->config_work);
@@ -2209,6 +2210,7 @@ static int virtcons_freeze(struct virtio_device *vdev)
 	 * Once more: if control_work_handler() was running, it would
 	 * enable the cb as the last step.
 	 */
+	if (use_multiport(portdev))
 		virtqueue_disable_cb(portdev->c_ivq);
 	remove_controlq_data(portdev);