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moddec: seek fast

--- a/examples/moddec.c

+++ b/examples/moddec.c

@@ -63,7 +63,7 @@

 		sysfatal("unknown/invalid mod");

 	if((t = (char*)duh_get_tag(f, "TITLE")) != nil && *t)

 		fprint(2, "%s\n", t);

-	ren = duh_start_sigrenderer(f, 0, 2, 0);

+	ren = duh_start_sigrenderer(f, 0, 2, pos*100000.0*SRATE/65536.0);

 	itren = duh_get_it_sigrenderer(ren);

 	dumb_it_set_loop_callback(itren, dumb_it_callback_terminate, nil);

 	dumb_it_set_xm_speed_zero_callback(itren, dumb_it_callback_terminate, nil);

@@ -73,16 +73,10 @@

 	n = 0;

 	for(;;){

-		if(pos > 0.0){

-			pos -= (double)n / SRATE;

-			n = MIN(pos*SRATE, Nsamp);

-			if(n < 1)

-				pos = 0.0;

-		}

 		n = duh_render_int(ren, &samp, &nsamp, 16, 0, 1.0, 65536.0f/SRATE, MAX(n, Nsamp), b);

 		if(n <= 0)

 			break;

-		if(pos <= 0.0 && write(1, b, n*2*2) != n*2*2)

+		if(write(1, b, n*2*2) != n*2*2)

 			break;

 	}