AP_TECS: fixed warning

libraries/AP_TECS/AP_TECS.cpp

@@ -372,7 +372,6 @@ void AP_TECS::_update_height_demand(void)
 {
 	// Apply 2 point moving average to demanded height
 	// This is required because height demand is only updated at 5Hz
-	float hgt_dem_orig = _hgt_dem;
 	_hgt_dem = 0.5f * (_hgt_dem + _hgt_dem_in_old);
 	_hgt_dem_in_old = _hgt_dem;