t/lib-submodule-update.sh: fix test ignoring ignored files in submodules

diff --git a/tree.c b/tree.c
index dd69423d9a3c1e1b9dd83df729ede543bfedc90a..b224115e0f4d61368560eba406a04f0259b7c4f0 100644 (file)
--- a/tree.c
+++ b/tree.c
@@ -234,8 +234,7 @@ int parse_tree_gently(struct tree *item, int quiet_on_missing)
 
 void free_tree_buffer(struct tree *tree)
 {
-       free(tree->buffer);
-       tree->buffer = NULL;
+       FREE_AND_NULL(tree->buffer);
        tree->size = 0;
        tree->object.parsed = 0;
 }