Update bmusb.

diff --git a/bmusb b/bmusb
index 2a06d276da04a363f0a7d4043b319229b0a5fd7f..e7d3ce1cdb423c5ba33f098f97383f099055d621 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit 2a06d276da04a363f0a7d4043b319229b0a5fd7f
+Subproject commit e7d3ce1cdb423c5ba33f098f97383f099055d621