virtio-ccw: remove qdev_unparent in unplug routing

This patch fixes unplugging a virtio-ccw device. We no
longer need to do that in virtio-ccw since common code does now
proper handling.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NJens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>

hw/s390x/virtio-ccw.c

@@ -865,7 +865,6 @@ static int virtio_ccw_busdev_unplug(DeviceState *dev)
 
     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0);
 
-    object_unparent(OBJECT(dev));
     qdev_free(dev);
     return 0;
 }