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rio: rewrite better portion() function

--- a/sys/src/cmd/rio/rio.c

+++ b/sys/src/cmd/rio/rio.c

@@ -392,16 +392,15 @@

 int

 portion(int x, int lo, int hi)

 {

-	int t;

 	x -= lo;

 	hi -= lo;

-	t = min(20, max(1, hi/2));

-	if(hi < t)

-		return x > 0 ? 2 : 0;

-	if(x < t)

-		return 0;

-	if(x > hi-t)

-		return 2;

+	if(x < hi/2){

+		if(x < 20)

+			return 0;

+	} else {

+		if(x > hi-20)

+			return 2;

+	}

 	return 1;

 }