Fix raster.Point.String() for new Printf semantics

R=nigeltao_golang, r2
CC=golang-dev
http://codereview.appspot.com/1728041

Committer: Nigel Tao <nigeltao@golang.org>

freetype/raster/raster.go

@@ -30,7 +30,7 @@ func (x Fixed) String() string {
 	if f < 0 {
 		f = -f
 	}
-	return fmt.Sprintf("%d:%03d", i, f)
+	return fmt.Sprintf("%d:%03d", int32(i), int32(f))
 }
 
 // maxAbs returns the maximum of abs(a) and abs(b).