Bugfix segfault with new helper track_time_interval (#5222)

* Bugfix sigfault with new helper track_time_interval

* Add none init also to sunrise/sunset for consistance

homeassistant/helpers/event.py

@@ -135,6 +135,8 @@ track_point_in_utc_time = threaded_listener_factory(
 
 def async_track_time_interval(hass, action, interval):
     """Add a listener that fires repetitively at every timedelta interval."""
+    remove = None
+
     def next_interval():
         """Return the next interval."""
         return dt_util.utcnow() + interval
@@ -164,6 +166,7 @@ def async_track_sunrise(hass, action, offset=None):
     """Add a listener that will fire a specified offset from sunrise daily."""
     from homeassistant.components import sun
     offset = offset or timedelta()
+    remove = None
 
     def next_rise():
         """Return the next sunrise."""
@@ -199,6 +202,7 @@ def async_track_sunset(hass, action, offset=None):
     """Add a listener that will fire a specified offset from sunset daily."""
     from homeassistant.components import sun
     offset = offset or timedelta()
+    remove = None
 
     def next_set():
         """Return next sunrise."""