fix a bug about loop call

Author: lengmo1996

src/diffusers/models/modeling_utils.py

@@ -1880,4 +1880,7 @@ def from_pretrained(cls, pretrained_model_name_or_path: Optional[Union[str, os.P
         # resolve remapping
         remapped_class = _fetch_remapped_cls_from_config(config, cls)
 
-        return remapped_class.from_pretrained(pretrained_model_name_or_path, **kwargs_copy)
+        if remapped_class is cls:
+            return super(LegacyModelMixin,remapped_class).from_pretrained(pretrained_model_name_or_path, **kwargs_copy)
+        else:
+            return remapped_class.from_pretrained(pretrained_model_name_or_path, **kwargs_copy)