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games/dmid: update for opl3 streaming

--- a/sys/src/games/dmid.c

+++ b/sys/src/games/dmid.c

@@ -450,24 +450,6 @@

 }

 void

-tproc(void *)

-{

-	uvlong t, Δt;

-	uchar u[4];

-	Trk x;

-

-	x.e = u + sizeof u;

-	t = nsec();

-	for(;;){

-		putcmd(0, 0, 1);

-		t += 10000000 / (Rate / 100);

-		Δt = (t - nsec()) / 1000000;

-		if(Δt > 0)

-			sleep(Δt);

-	}

-}

-

-void

 readinst(char *file)

 {

 	int n;

@@ -581,14 +563,11 @@

 	putcmd(Rop3, 1, 0);

 	trace = debug;

 	if(stream){

-		if(proccreate(tproc, nil, mainstacksize) < 0)

-			sysfatal("proccreate: %r");

 		for(;;){

 			getvar(nil);

 			if(ev(nil, 0) < 0)

-				break;

+				threadexits(nil);

 		}

-		threadexitsall(n < 0 ? "read: %r" : nil);

 	}

 	for(end=0; !end;){

 		end = 1;