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libmemdraw: fix clamp() macro abuse in correlate()

up to three fix2int() executions on a bad day!

--- a/sys/src/libmemdraw/warp.c

+++ b/sys/src/libmemdraw/warp.c

@@ -705,10 +705,10 @@

 		Σr += r; Σg += g; Σb += b; Σa += a;

 	}

-	r = clamp(fix2int(Σr), 0, 0xFF);

-	g = clamp(fix2int(Σg), 0, 0xFF);

-	b = clamp(fix2int(Σb), 0, 0xFF);

-	a = clamp(fix2int(Σa), 0, 0xFF);

+	r = fix2int(Σr); r = clamp(r, 0, 0xFF);

+	g = fix2int(Σg); g = clamp(g, 0, 0xFF);

+	b = fix2int(Σb); b = clamp(b, 0, 0xFF);

+	a = fix2int(Σa); a = clamp(a, 0, 0xFF);

 	return r<<24|g<<16|b<<8|a;

 }

-- 

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