quadtree: Unlink parent when rebalancing a subtree

[sdl-planets] / quadtree.c

diff --git a/quadtree.c b/quadtree.c
index 30e306ed58983d70a371e2007063cb6bfc6332f8..1cb97563874d51770f73a89c7183883d934dbd43 100644 (file)
--- a/quadtree.c
+++ b/quadtree.c
@@ -688,6 +688,7 @@ struct quadtree *quadtree_del(struct quadtree *node,
                        trap();
 
                parent = node->parent;
+               node->parent = NULL;
 
                /*
                 * The sub branch is now detached from the main