common/file_helpers: remove xx stuff (#30772)

* remove xx stuff

* cleanup
old-commit-hash: 1346704426ef247a74de3922da670e53251858d9

common/tests/test_file_helpers.py

@@ -2,7 +2,6 @@ import os
 import unittest
 from uuid import uuid4
 
-from openpilot.common.file_helpers import atomic_write_on_fs_tmp
 from openpilot.common.file_helpers import atomic_write_in_dir
 
 
@@ -11,14 +10,12 @@ class TestFileHelpers(unittest.TestCase):
     path = f"/tmp/tmp{uuid4()}"
     with atomic_write_func(path) as f:
       f.write("test")
+      assert not os.path.exists(path)
 
     with open(path) as f:
       self.assertEqual(f.read(), "test")
     os.remove(path)
 
-  def test_atomic_write_on_fs_tmp(self):
-    self.run_atomic_write_func(atomic_write_on_fs_tmp)
-
   def test_atomic_write_in_dir(self):
     self.run_atomic_write_func(atomic_write_in_dir)