Update bmusb submodule.

diff --git a/bmusb b/bmusb
index e6f8f805a7224fedf90ba90ef5a3ca83d21b6c6b..fbfef809541ca1910ff09a817f04a4a3baff64e3 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit e6f8f805a7224fedf90ba90ef5a3ca83d21b6c6b
+Subproject commit fbfef809541ca1910ff09a817f04a4a3baff64e3