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libpcm: fix buggy use of clip macro (evaluates its arg twice)

--- a/sys/src/libpcm/conv.c

+++ b/sys/src/libpcm/conv.c

@@ -52,7 +52,15 @@

 #define MAXINT	((int)(~0UL>>1))

 #define MININT	(MAXINT+1)

-#define clip(v)	((v) > MAXINT ? MAXINT : ((v) < MININT ? MININT : (v)))

+static int

+clip(vlong v)

+{

+	if(v > MAXINT)

+		return MAXINT;

+	if(v < MININT)

+		return MININT;

+	return v;

+}

 static int

 chaninit(Chan *c, int irate, int orate, int count, uintptr caller)

-- 

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