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nusb/audio: fix %.*s format usage

--- a/sys/src/cmd/nusb/audio/audio.c

+++ b/sys/src/cmd/nusb/audio/audio.c

@@ -122,7 +122,8 @@

 	char msg[256], *f[4];

 	int nf, speed;

-	snprint(msg, sizeof(msg), "%.*s", r->ifcall.count, r->ifcall.data);

+	snprint(msg, sizeof(msg), "%.*s",

+		utfnlen((char*)r->ifcall.data, r->ifcall.count), (char*)r->ifcall.data);

 	nf = tokenize(msg, f, nelem(f));

 	if(nf < 2){

 		respond(r, "invalid ctl message");

-- 

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