replaced printf -> robot::console

plugins/voxel_layer.cpp

@@ -316,7 +316,7 @@ void VoxelLayer::raytraceFreespace(const Observation& clearing_observation, doub
 
   if (!worldToMap3DFloat(ox, oy, oz, sensor_x, sensor_y, sensor_z))
   {
-    printf(
+    robot::log_error(
         "The origin for the sensor at (%.2f, %.2f, %.2f) is out of map bounds. So, the costmap cannot raytrace for it.\n",
         ox, oy, oz);
     return;