sis900: 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/sis/sis900.c b/drivers/net/ethernet/sis/sis900.c
index 6072f09..7bea17c 100644
--- a/drivers/net/ethernet/sis/sis900.c
+++ b/drivers/net/ethernet/sis/sis900.c
@@ -2258,7 +2258,6 @@
 		case IF_PORT_100BASEFX: /* 100BaseFx */
                 	/* These Modes are not supported (are they?)*/
 			return -EOPNOTSUPP;
-			break;
 
 		default:
 			return -EINVAL;