Added destructor for controller

src/turboPmacController.cpp

@@ -179,6 +179,8 @@ turboPmacController::turboPmacController(const char *portName,
     }
 }
 
+turboPmacController::~turboPmacController(void) {}
+
 /*
 Access one of the axes of the controller via the axis adress stored in asynUser.
 If the axis does not exist or is not a Axis, a nullptr is returned and an