fix typo in skipping dataset

run_speech_recognition_ctc.py

@@ -478,7 +478,7 @@ def main():
             data_args.eval_split_name.split(","),
         ):
 
-            if train_split_name != "None":
+            if eval_split_name != "None":
                 if "eval" not in raw_datasets:
                     raw_datasets["eval"] = load_dataset(
                         dataset_name,