[bugfix] fix mcore to hf (#5929)

Author: Jintao-Huang

swift/megatron/utils/convert.py

@@ -283,7 +283,7 @@ def convert_mcore2hf(args: ExportArguments) -> None:
         mg_model = peft_model.merge_and_unload()
     logger.info('Megatron model created successfully.')
     if args.to_hf:
-        hf_model = prepare_model_template(args, patch_offload=not args.test_convert_precision)[0]
+        hf_model, template = prepare_model_template(args, patch_offload=not args.test_convert_precision)
         megatron_model_meta.convert_mcore2hf(hf_model, mg_model)
         if args.test_convert_precision:
             test_convert_precision(hf_model, mg_model, template, args.test_convert_dtype)