de2104x: fix the TX watchdog

Insert de_init_rings() to reinit the rings before de_init_hw()
tries to access them again.

Signed-off-by: Francois Romieu <[e-mail]>

drivers/net/tulip/de2104x.c

···
 	synchronize_irq(dev->irq);
 	de_clean_rings(de);
 
+	de_init_rings(de);
+
 	de_init_hw(de);
 	
 	netif_wake_queue(dev);