refresh libusual

diff --git a/lib b/lib
index 1a1189f36377d08e95d898b978aba4bcf7494848..88992f86f36429a38136d369fdb16020c8c9fa8d 160000 (submodule)
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit 1a1189f36377d08e95d898b978aba4bcf7494848
+Subproject commit 88992f86f36429a38136d369fdb16020c8c9fa8d