Fix warning

source/RobotAPI/components/units/RobotUnit/NJointControllers/NJointTaskSpaceImpedanceController.cpp

@@ -96,7 +96,7 @@ void NJointTaskSpaceImpedanceController::rtRun(const IceUtil::Time& /*sensorValu
                                           velocitySensors,
                                           positionSensors
                                       );
-    ARMARX_CHECK_EQUAL(targets.size(), jointDesiredTorques.size());
+    ARMARX_CHECK_EQUAL(targets.size(), static_cast<size_t>(jointDesiredTorques.size()));
 
     for (size_t i = 0; i < targets.size(); ++i)
     {