fix log formatting warnings (issue #103)

Author: kbrameld

ros_trick/ros_src/trick_ros2_control/src/trick_system.cpp

@@ -82,7 +82,7 @@ hardware_interface::CallbackReturn TrickSystem::on_configure(const rclcpp_lifecy
   {
     std::string err = "could not connect to Trick server on host: " + trick_hostname_ +
                       " and port: " + std::to_string(trick_server_port_);
-    RCLCPP_FATAL(rclcpp::get_logger("TrickSystem"), err.c_str());
+    RCLCPP_FATAL(rclcpp::get_logger("TrickSystem"), "%s", err.c_str());
     return hardware_interface::CallbackReturn::ERROR;
   }
 
@@ -235,8 +235,8 @@ hardware_interface::return_type TrickSystem::read(const rclcpp::Time& /*time*/,
   {
     RCLCPP_FATAL(rclcpp::get_logger("TrickSystem"),
                  "size of data received from trick does not match number of "
-                 "declared state variables. Expected: %d. "
-                 "Got: %d",
+                 "declared state variables. Expected: %zu. "
+                 "Got: %zu",
                  trick_state_variables_.size(), raw_doubles_from_trick.size());
     return hardware_interface::return_type::OK;
   }