commit: add short-circuit to paint_down_to_common()

diff --git a/alloc.c b/alloc.c
index cf4f8b61e126c0e9992dc34c6cb52b6f896a565d..e8ab14f4a12bc65eb32152192af1faf719e3423c 100644 (file)
--- a/alloc.c
+++ b/alloc.c
@@ -94,6 +94,7 @@ void *alloc_commit_node(void)
        c->object.type = OBJ_COMMIT;
        c->index = alloc_commit_index();
        c->graph_pos = COMMIT_NOT_FROM_GRAPH;
+       c->generation = GENERATION_NUMBER_INFINITY;
        return c;
 }