Reduce finished path memory usage

core/src/mindustry/ai/ControlPathfinder.java

@@ -576,16 +576,14 @@ public class ControlPathfinder{
                 result.reverse();
 
                 smoothPath();
-            }else{
-                //don't keep this around in memory, better to dump entirely - using clear() keeps around massive arrays for invalid paths
-                frontier = new PathfindQueue();
-                cameFrom = new IntIntMap();
-                costs = new IntFloatMap();
             }
 
-            done = true;
+            //don't keep this around in memory, better to dump entirely - using clear() keeps around massive arrays for paths
+            frontier = new PathfindQueue();
+            cameFrom = new IntIntMap();
+            costs = new IntFloatMap();
 
-            //TODO free resources?
+            done = true;
         }
 
         void smoothPath(){