shpc: unparent device before free

Recent core change removed unparent
so we need to do this in all callers now.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/shpc.c

@@ -253,6 +253,7 @@ static void shpc_free_devices_in_slot(SHPCDevice *shpc, int slot)
          ++devfn) {
         PCIDevice *affected_dev = shpc->sec_bus->devices[devfn];
         if (affected_dev) {
+            object_unparent(OBJECT(affected_dev));
             qdev_free(&affected_dev->qdev);
         }
     }