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games/gb: limit audio range to prevent clipping

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

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

@@ -270,8 +270,8 @@

 	s[1] *= 1 + (cntl >> 4 & 7);

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

-		sbufp[0] = s[0] * 60;

-		sbufp[1] = s[1] * 60;

+		sbufp[0] = s[0] * 30;

+		sbufp[1] = s[1] * 30;

 		sbufp += 2;

 	}

 }

-- 

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