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zuke: apply clipping after replay gain (some cases found in track mode)

--- a/sys/src/cmd/audio/zuke/zuke.c

+++ b/sys/src/cmd/audio/zuke/zuke.c

@@ -673,6 +673,16 @@

 	return 0;

 }

+static int

+clip16(int v)

+{

+	if(v > 0x7fff)

+		return 0x7fff;

+	if(v < -0x8000)

+		return -0x8000;

+	return v;

+}

+

 static void

 gain(double g, char *buf, long n)

 {

@@ -680,8 +690,8 @@

 	if(g != 1.0)

 		for(f = (s16int*)buf; n >= 4; n -= 4){

-			*f = g * *f++;

-			*f = g * *f++;

+			*f++ = clip16(*f * g);

+			*f++ = clip16(*f * g);

 		}

 }