TEMP: Tweak handling of atexit unregistering

tests/conftest.py

@@ -79,13 +79,11 @@ def aioca_cleanup():
     # by cothread. If we don't do this we get a seg fault. This is not a problem
     # in production as we won't mix aioca and cothread, but we do mix them in
     # the tests so need to do this.
-    # In aioca 1.8 the name of the cleanup function changed.
-    if Version(__version__) >= Version("1.8"):
-        unregister_func = _catools._Context._teardown
-    else:
+    # In aioca 1.8 the atexit function was changed to no longer cause this issue
+    if Version(__version__) < Version("1.8"):
         unregister_func = _catools._Context._destroy_context
+        atexit.unregister(unregister_func)
 
-    atexit.unregister(unregister_func)
     # purge the channels before the event loop goes
     purge_channel_caches()