MXS-2002 Add additional versions of Worker::[call|execute]()

server/core/worker.cc

@@ -516,6 +516,12 @@ bool Worker::execute(GenericFunction func, Semaphore* pSem, execute_mode_t mode)
     return rval;
 }
 
+bool Worker::call(Task& task, execute_mode_t mode)
+{
+    Semaphore sem;
+    return execute(&task, &sem, mode) && sem.wait();
+}
+
 bool Worker::call(GenericFunction func, execute_mode_t mode)
 {
     Semaphore sem;

server/modules/monitor/mariadbmon/mariadbmon.cc

@@ -972,7 +972,7 @@ void MariaDBMonitor::disable_setting(const std::string& setting)
         p.name = const_cast<char*>(setting.c_str());
         p.value = const_cast<char*>("false");
         monitor_add_parameters(m_monitor, &p);
-    }, NULL, EXECUTE_AUTO);
+    }, EXECUTE_AUTO);
 }
 
 /**