Fix next id call in test_from_entry (#528)

* Fix next id call in test_from_entry

* Fix PEP8

Author: jackieleng

djcelery/tests/test_schedulers.py

@@ -102,9 +102,9 @@ def test_entry(self):
 
     def test_from_entry(self):
         name = 'interval-vs-crontab'
-        entry = {'task': 'djcelery.unittest.add{0}'.format(_next_id()),
+        entry = {'task': 'djcelery.unittest.add{0}'.format(next(_ids)),
                  'args': '[2, 2]',
-                 'schedule': timedelta(hours=24),}
+                 'schedule': timedelta(hours=24), }
         self.Entry.from_entry(name, **entry)
         schedule1 = PeriodicTask.objects.get(name=name).schedule
         self.assertIsInstance(schedule1, schedule)