Fix the tx interrupt handler to free completed tx descriptors even
when NAPI is enabled.  Otherwise, the tx queue would fill up resulting
in poor performance and "NETDEV WATCHDOG: <iface>: transmit timed out"
messages.
Signed-off-by: Brent Cook <bcook@bpointsys.com>
Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
 #else
        if (eth_int_cause & ETH_INT_CAUSE_RX)
                mv643xx_eth_receive_queue(dev, INT_MAX);
+#endif
        if (eth_int_cause_ext & ETH_INT_CAUSE_TX)
                mv643xx_eth_free_completed_tx_descs(dev);
-#endif
 
        /*
         * If no real interrupt occured, exit.