Upgrade bmusb.

diff --git a/bmusb b/bmusb
index 838846a92ca196aa8d5c4169d4478d18b9486432..36ed21d8e2c4590d7f6489efc05489f21da8d5be 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit 838846a92ca196aa8d5c4169d4478d18b9486432
+Subproject commit 36ed21d8e2c4590d7f6489efc05489f21da8d5be