adding getCostScalingFactor (#3290)

Author: SteveMacenski

nav2_costmap_2d/include/nav2_costmap_2d/inflation_layer.hpp

@@ -172,6 +172,11 @@ class InflationLayer : public Layer
     return access_;
   }
 
+  double getCostScalingFactor()
+  {
+    return cost_scaling_factor_;
+  }
+
 protected:
   /**
    * @brief Process updates on footprint changes to the inflation layer

nav2_costmap_2d/plugins/inflation_layer.cpp

@@ -442,7 +442,7 @@ InflationLayer::dynamicParametersCallback(
         need_reinflation_ = true;
         need_cache_recompute = true;
       } else if (param_name == name_ + "." + "cost_scaling_factor" && // NOLINT
-        cost_scaling_factor_ != parameter.as_double())
+        getCostScalingFactor() != parameter.as_double())
       {
         cost_scaling_factor_ = parameter.as_double();
         need_reinflation_ = true;