[1.11.x] Removed unused variables that are overwritten.

Backport of ebf34c3cdc from master

tests/urlpatterns_reverse/tests.py

@@ -422,7 +422,6 @@ class ResolverTests(SimpleTestCase):
         e = cm.exception
         # make sure we at least matched the root ('/') url resolver:
         self.assertIn('tried', e.args[0])
-        tried = e.args[0]['tried']
         self.assertEqual(
             len(e.args[0]['tried']),
             len(url_types_names),