Fix lint errors and typo

salt/states/file.py

@@ -635,6 +635,7 @@ def _clean_dir(root, keep, exclude_pat):
     '''
     real_keep = _find_keep_files(root, keep)
     removed = set()
+
     def _delete_not_kept(nfn):
         if nfn not in real_keep:
             # -- check if this is a part of exclude_pat(only). No need to

tests/unit/states/test_file.py

@@ -1849,7 +1849,7 @@ class TestFindKeepFiles(TestCase):
 
     @skipIf(salt.utils.is_windows(), 'Do not run on Windows')
     def test__find_keep_files_unix(self):
-        keep = filestate._find_keep_files_old(
+        keep = filestate._find_keep_files(
             '/test/parent_folder',
             ['/test/parent_folder/meh.txt']
         )