Update the bmusb copy.

diff --git a/bmusb b/bmusb
index e287f28087aef9cfd6aa47acd0d283bc177a9d70..b447be096623b949a2117c71af03bb96d329d988 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit e287f28087aef9cfd6aa47acd0d283bc177a9d70
+Subproject commit b447be096623b949a2117c71af03bb96d329d988