igb: remove unnecessary break after return

Signed-off-by: NFabian Frederick <fabf@skynet.be>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/intel/igb/e1000_82575.c

@@ -579,7 +579,6 @@ static s32 igb_get_invariants_82575(struct e1000_hw *hw)
 		break;
 	default:
 		return -E1000_ERR_MAC_INIT;
-		break;
 	}
 
 	/* Set media type */