bpo-41241: Unnecessary Type casting in 'if condition' (GH-21396)

This is my first issue!
So, if there's anything wrong, please tell me!

Also, thank you always for all the contributors!

Automerge-Triggered-By: GH:asvetlov

Lib/asyncio/futures.py

@@ -115,7 +115,7 @@ class Future:
 
     @_log_traceback.setter
     def _log_traceback(self, val):
-        if bool(val):
+        if val:
             raise ValueError('_log_traceback can only be set to False')
         self.__log_traceback = False