:art: fix m_vector_add

diff --git a/util b/util
index 1f29f914b17fb36a79601bc6bc207d9ec85089c9..61b99ae6fabebb32296a84c8fe178c24a5660405 160000 (submodule)
--- a/util
+++ b/util
@@ -1 +1 @@
-Subproject commit 1f29f914b17fb36a79601bc6bc207d9ec85089c9
+Subproject commit 61b99ae6fabebb32296a84c8fe178c24a5660405