calling stop instead of directlying canceling ttask

Author: stephanelsmith

v3/primitives/delay_ms.py

@@ -71,5 +71,5 @@ def callback(self, func=None, args=()):
         self._args = args
 
     def deinit(self):
-        self._ttask.cancel()
+        self.stop()
         self._mtask.cancel()