fix bug in modelV2 service which was triggering test_loggerd failure (#32892)

* fix services bug

* add nonzero decimation assert

cereal/messaging/tests/test_services.py

@@ -15,6 +15,7 @@ class TestServices(unittest.TestCase):
   def test_services(self, s):
     service = SERVICE_LIST[s]
     self.assertTrue(service.frequency <= 104)
+    self.assertTrue(service.decimation != 0)
 
   def test_generated_header(self):
     with tempfile.NamedTemporaryFile(suffix=".h") as f:

cereal/services.py

@@ -61,7 +61,7 @@ _services: dict[str, tuple] = {
   "wideRoadEncodeIdx": (False, 20., 1),
   "wideRoadCameraState": (True, 20., 20),
   "drivingModelData": (True, 20., 10),
-  "modelV2": (True, 20., 0),
+  "modelV2": (True, 20.),
   "managerState": (True, 2., 1),
   "uploaderState": (True, 0., 1),
   "navInstruction": (True, 1., 10),