Fix compiling with -Wall -W.

[meshlink] / src / utcp

diff --git a/src/utcp b/src/utcp
index 1d8aa0d5a55bb871ce56bca355ade80b08a7c1e5..558c6d183e2a580b811c5603dd48c33b01a3dc7e 160000 (submodule)
--- a/src/utcp
+++ b/src/utcp
@@ -1 +1 @@
-Subproject commit 1d8aa0d5a55bb871ce56bca355ade80b08a7c1e5
+Subproject commit 558c6d183e2a580b811c5603dd48c33b01a3dc7e