Avoid allocating packet buffers unnecessarily.

[meshlink] / src / utcp

diff --git a/src/utcp b/src/utcp
index 0c3abf9e3538c482639ed32b0e85104495db5b4f..fa38b03a6d236619d27df086f46c379476026242 160000 (submodule)
--- a/src/utcp
+++ b/src/utcp
@@ -1 +1 @@
-Subproject commit 0c3abf9e3538c482639ed32b0e85104495db5b4f
+Subproject commit fa38b03a6d236619d27df086f46c379476026242