Update bmusb.

diff --git a/bmusb b/bmusb
index 12fc3ca26e888caa54fcf1ad6e47593b3f39f6d4..6a027cb2d982c385859150ad1558a1e205817844 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit 12fc3ca26e888caa54fcf1ad6e47593b3f39f6d4
+Subproject commit 6a027cb2d982c385859150ad1558a1e205817844