rabbit_maintenance: dialyzer fix

Author: mkuratczyk

deps/rabbit/src/rabbit_maintenance.erl

@@ -196,7 +196,7 @@ transfer_leadership_of_quorum_queues(_TransferCandidates) ->
     Queues = rabbit_amqqueue:list_local_leaders(),
     ?LOG_INFO("Will transfer leadership of ~b quorum queues with current leader on this node",
               [length(Queues)]),
-    [begin
+    _ = [begin
         Name = amqqueue:get_name(Q),
         ?LOG_DEBUG("Will trigger a leader election for local quorum queue ~ts",
                    [rabbit_misc:rs(Name)]),
@@ -249,7 +249,7 @@ stop_local_quorum_queue_followers() ->
     Queues = rabbit_amqqueue:list_local_followers(),
     ?LOG_INFO("Will stop local follower replicas of ~b quorum queues on this node",
               [length(Queues)]),
-    [begin
+    _ = [begin
         Name = amqqueue:get_name(Q),
         ?LOG_DEBUG("Will stop a local follower replica of quorum queue ~ts",
                    [rabbit_misc:rs(Name)]),