refs.c: spell NULL pointer as NULL

diff --git a/reachable.c b/reachable.c
index e7e6a1e342200bbf4c37bd561e6a68222349418e..654a8c58d689daf43f2ba4c40e4fe54d31c7826a 100644 (file)
--- a/reachable.c
+++ b/reachable.c
@@ -80,8 +80,7 @@ static void process_tree(struct tree *tree,
                else
                        process_blob(lookup_blob(entry.sha1), p, &me, entry.path, cp);
        }
-       free(tree->buffer);
-       tree->buffer = NULL;
+       free_tree_buffer(tree);
 }
 
 static void process_tag(struct tag *tag, struct object_array *p,