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games/nes: reduce volume, causes overflow and confuses ac97

--- a/sys/src/games/nes/apu.c

+++ b/sys/src/games/nes/apu.c

@@ -225,6 +225,7 @@

 audiosample(void)

 {

 	double d;

+	static int i;

 	if(sbufp == nil)

 		return;

@@ -231,8 +232,8 @@

 	d = 95.88 / (8128.0 / (0.01 + pulse(0) + pulse(1)) + 100);

 	d += 159.79 / (1.0 / (0.01 + tri()/8227.0 + noise()/12241.0 + dmc()/22638.0) + 100.0);

 	if(sbufp < sbuf + nelem(sbuf) - 1){

-		*sbufp++ = d * 20000;

-		*sbufp++ = d * 20000;

+		*sbufp++ = d * 10000;

+		*sbufp++ = d * 10000;

 	}

 }