Use the new has_signal flag.

[nageru] / bmusb

diff --git a/bmusb b/bmusb
index bb575c1ac8b1496394732800898c27a3a812f0a9..b3aaee8df3039891d79f4f673e6a8050d3fb65b5 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit bb575c1ac8b1496394732800898c27a3a812f0a9
+Subproject commit b3aaee8df3039891d79f4f673e6a8050d3fb65b5