avoid implicit type case (#4098)

Author: SteveMacenski

nav2_smac_planner/include/nav2_smac_planner/node_hybrid.hpp

@@ -406,7 +406,7 @@ class NodeHybrid
   static float getObstacleHeuristic(
     const Coordinates & node_coords,
     const Coordinates & goal_coords,
-    const double & cost_penalty);
+    const float & cost_penalty);
 
   /**
    * @brief Compute the Distance heuristic

nav2_smac_planner/src/node_hybrid.cpp

@@ -559,7 +559,7 @@ float NodeHybrid::adjustedFootprintCost(const float & cost)
 float NodeHybrid::getObstacleHeuristic(
   const Coordinates & node_coords,
   const Coordinates & goal_coords,
-  const double & cost_penalty)
+  const float & cost_penalty)
 {
   // If already expanded, return the cost
   const unsigned int size_x = sampled_costmap->getSizeInCellsX();