niu: remove unnecessary break after return

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c
index 79606f47a..db8ffde 100644
--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -2584,7 +2584,6 @@
 				break;
 			default:
 				return -EINVAL;
-				break;
 			}
 			phy_addr_off = niu_atca_port_num[np->port];
 			break;