rabbitmq_recent_history_exchange: Fix Dialyzer warning in rabbit_exchange_type_recent_history

    rabbit_exchange_type_recent_history.erl:120:5: Expression produces a value of type
              {'aborted', _} | {'atomic', 'ok'}, but this value is unmatched

Author: dumbbell

deps/rabbitmq_recent_history_exchange/src/rabbit_exchange_type_recent_history.erl

@@ -117,7 +117,7 @@ setup_schema() ->
 
 disable_plugin() ->
     rabbit_registry:unregister(exchange, <<"x-recent-history">>),
-    rabbit_db_rh_exchange:delete(),
+    _ = rabbit_db_rh_exchange:delete(),
     ok.
 
 %%----------------------------------------------------------------------------