Be more defensive when removing federated queue links

if terminate_child/2 above fails, so will delete_child/2.

Author: michaelklishin

deps/rabbitmq_federation/src/rabbit_federation_queue_link_sup_sup.erl

@@ -65,7 +65,7 @@ stop_child(Q) ->
           [rabbit_misc:rs(QueueName), Err]),
         ok
     end,
-    ok = mirrored_supervisor:delete_child(?SUPERVISOR, id(Q)).
+    _ = mirrored_supervisor:delete_child(?SUPERVISOR, id(Q)).
 
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