BUG#25495393: GROUP REPLICATION CAN USE SOME VERBOSITY IN THE ERROR LOG

Fix a memory leak on Gcs_view handling on gcs_event_handlers.cc.

Author: nacarvalho

rapid/plugin/group_replication/src/gcs_event_handlers.cc

@@ -537,10 +537,18 @@ Plugin_gcs_events_handler::on_view_changed(const Gcs_view& new_view,
 
   if (!is_leaving)
   {
+    std::string view_id_representation= "";
+    Gcs_view *view= gcs_module->get_current_view();
+    if (view != NULL)
+    {
+      view_id_representation= view->get_view_id().get_representation();
+      delete view;
+    }
+
     log_message(MY_INFORMATION_LEVEL,
                 "Group membership changed to %s on view %s.",
                 group_member_mgr->get_string_current_view_active_hosts().c_str(),
-                gcs_module->get_current_view()->get_view_id().get_representation().c_str());
+                view_id_representation.c_str());
   }
   else
   {