Add a switch to print video latency.

[nageru] / bmusb

diff --git a/bmusb b/bmusb
index a765e066b74ac52ff0abf239d430d6f8d83f792e..227166d4398263e1191bdfe244f62bc38aaf4c1f 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit a765e066b74ac52ff0abf239d430d6f8d83f792e
+Subproject commit 227166d4398263e1191bdfe244f62bc38aaf4c1f