fix variant

Author: SunMarc

src/diffusers/models/model_loading_utils.py

@@ -358,6 +358,7 @@ def _fetch_index_file_legacy(
     revision,
     user_agent,
     commit_hash,
+    dduf_entries=None,
 ):
     if is_local:
         index_file = Path(
@@ -398,6 +399,7 @@ def _fetch_index_file_legacy(
                     subfolder=None,
                     user_agent=user_agent,
                     commit_hash=commit_hash,
+                    dduf_entries=dduf_entries,
                 )
                 index_file = Path(index_file)
                 deprecation_message = f"This serialization format is now deprecated to standardize the serialization format between `transformers` and `diffusers`. We recommend you to remove the existing files associated with the current variant ({variant}) and re-obtain them by running a `save_pretrained()`."