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aux/wm8960: provide hardcoded "speed" in volume file

--- a/sys/src/cmd/aux/wm8960.c

+++ b/sys/src/cmd/aux/wm8960.c

@@ -87,12 +87,9 @@

 {

 	int zc;

-	l = CLAMP(l, 0, 100);

-	r = CLAMP(r, 0, 100);

+	o->vol[0] = l = CLAMP(l, 0, 100);

+	o->vol[1] = r = CLAMP(r, 0, 100);

-	o->vol[0] = l;

-	o->vol[1] = r;

-

 	if(l > 0)

 		l += o->volmax - 100;

 	if(r > 0)

@@ -149,6 +146,7 @@

 	}else if(r->fid->file->aux == (void*)Vol){

 		for(i = 0, o = out; i < Nout; i++, o++)

 			s = seprint(s, e, "%s %d %d\n", o->name, o->vol[0], o->vol[1]);

+		seprint(s, e, "speed 44100\n");

 	}

 	readstr(r, msg);