Removed unused variable in QuerySet._earliest_or_latest().
@@ -562,7 +562,6 @@ class QuerySet:
if fields and field_name is not None:
raise ValueError('Cannot use both positional arguments and the field_name keyword argument.')
- order_by = None
if field_name is not None:
warnings.warn(
'The field_name keyword argument to earliest() and latest() '
