Send the audio format explicitly down, not just the ID.

[nageru] / bmusb

diff --git a/bmusb b/bmusb
index b3aaee8df3039891d79f4f673e6a8050d3fb65b5..30a75fd8110601c89ecc7c1a0832a96878917cd4 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit b3aaee8df3039891d79f4f673e6a8050d3fb65b5
+Subproject commit 30a75fd8110601c89ecc7c1a0832a96878917cd4