del instead of assigning None

Author: mgeier

sounddevice.py

@@ -2501,8 +2501,6 @@ class _CallbackContext:
     """Helper class for reuse in play()/rec()/playrec() callbacks."""
 
     blocksize = None
-    data = None
-    out = None
     frame = 0
     frames: int
     input_channels = output_channels = None
@@ -2635,8 +2633,8 @@ def callback_exit(self):
     def finished_callback(self):
         self.event.set()
         # Drop temporary audio buffers to free memory
-        self.data = None
-        self.out = None
+        del self.data
+        del self.out
         # Drop CFFI objects to avoid reference cycles
         self.stream._callback = None
         self.stream._finished_callback = None