Fix sigterm_handler (#6141)

python/ray/node.py

@@ -206,10 +206,10 @@ class Node(object):
 
         atexit.register(atexit_handler)
 
-        # Register the a handler to be called if we get a SIGTERM.
+        # Register the handler to be called if we get a SIGTERM.
         # In this case, we want to exit with an error code (1) after
         # cleaning up child processes.
-        def sigterm_handler():
+        def sigterm_handler(signum, frame):
             return clean_up_children(lambda *args, **kwargs: sys.exit(1))
 
         signal.signal(signal.SIGTERM, sigterm_handler)