Remove dead code from navfn planner (#1682)

nav2_navfn_planner/src/navfn_planner.cpp

@@ -273,39 +273,6 @@ NavfnPlanner::smoothApproachToGoal(
   plan.poses.push_back(goal_copy);
 }
 
-bool
-NavfnPlanner::computePotential(const geometry_msgs::msg::Point & world_point)
-{
-  // make sure to resize the underlying array that Navfn uses
-  planner_->setNavArr(
-    costmap_->getSizeInCellsX(),
-    costmap_->getSizeInCellsY());
-
-  planner_->setCostmap(costmap_->getCharMap(), true, allow_unknown_);
-
-  unsigned int mx, my;
-  if (!worldToMap(world_point.x, world_point.y, mx, my)) {
-    return false;
-  }
-
-  int map_start[2];
-  map_start[0] = 0;
-  map_start[1] = 0;
-
-  int map_goal[2];
-  map_goal[0] = mx;
-  map_goal[1] = my;
-
-  planner_->setStart(map_start);
-  planner_->setGoal(map_goal);
-
-  if (use_astar_) {
-    return planner_->calcNavFnAstar();
-  }
-
-  return planner_->calcNavFnDijkstra();
-}
-
 bool
 NavfnPlanner::getPlanFromPotential(
   const geometry_msgs::msg::Pose & goal,