Fix destruction order in lifecycle benchmark (ros2#1675)

Signed-off-by: Scott K Logan <[email protected]>

Author: cottsay

rclcpp_lifecycle/test/benchmark/benchmark_lifecycle_client.cpp

@@ -212,8 +212,9 @@ class BenchmarkLifecycleClient : public performance_test_fixture::PerformanceTes
     performance_test_fixture::PerformanceTest::TearDown(state);
     executor->cancel();
     spinner_.join();
-    lifecycle_node.reset();
+    executor.reset();
     lifecycle_client.reset();
+    lifecycle_node.reset();
     rclcpp::shutdown();
   }