Update check_file() (#3622)

* Update `check_file()`

* Update datasets.py

utils/datasets.py

@@ -1095,7 +1095,7 @@ def dataset_stats(path='coco128.yaml', autodownload=False, verbose=False):
         autodownload:   Attempt to download dataset if not found locally
         verbose:        Print stats dictionary
     """
-    with open(check_file(Path(path))) as f:
+    with open(check_file(path)) as f:
         data = yaml.safe_load(f)  # data dict
     check_dataset(data, autodownload)  # download dataset if missing
     nc = data['nc']  # number of classes