Fix test_os.test_symlink(): remove create symlink
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index f7d64b7..1117875 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -2554,6 +2554,8 @@
 
     @support.skip_unless_symlink
     def test_symlink(self):
+        self.addCleanup(support.unlink, support.TESTFN)
+
         filename = os.fsencode(support.TESTFN)
         with bytes_filename_warn(True):
             os.symlink(filename, filename)