remove break statements

Author: glaukiol1

os/os.module.go

@@ -107,14 +107,12 @@ func getenv(self py.Object, args py.Tuple) (py.Object, error) {
 	case 1:
 		key = args[0]
 		dflt = py.None
-		break
 	case 2:
 		key = args[0]
 		if !objectIsString(args[1]) {
 			return nil, py.ExceptionNewf(py.TypeError, "str expected (pos 2), not "+args[1].Type().Name)
 		}
 		dflt = args[1]
-		break
 	}
 	gokey, err := py.ReprAsString(key)
 	if err != nil {