btr_slice_out_node(): Set parent to NULL.

Without this, a subsequent btr_remove_node() on the spliced
out node could segfault.

diff --git a/buffer_tree.c b/buffer_tree.c
index 08892b4b4b4b31b8985f58d707197bc527987435..7d79636fac717f4e4cb8559dec698f8204eed34c 100644 (file)
--- a/buffer_tree.c
+++ b/buffer_tree.c
@@ -825,6 +825,7 @@ void btr_splice_out_node(struct btr_node *btrn)
                        list_move(&ch->node, &btrn->parent->children);
        }
        assert(list_empty(&btrn->children));
+       btrn->parent = NULL;
 }
 
 /**