CP0 Descriptor not always updated

In case of a multiple slave device the descriptor is not updated in all cases. If a slave in a large setup changed during CP0 to FastForward and gets on both ports S-Frames, the slave has to insert the sercos addresses inverted into the frame. Later on the topology changed, the slave is still in FastForward but gets different frames on the ports (on one port S-Frames on the other port P-Frames). If this case, the addresses must be inserted not inverted. But the descriptor was not updated in the case no topology change on the slave but the Frames on the ports changed.