More go fmt.

sysdata_darwin.go

@@ -282,7 +282,7 @@ func (s *sysData) setRect(x int, y int, width int, height int, winheight int) er
 	// winheight - y because (0,0) is the bottom-left corner of the window and not the top-left corner
 	// (winheight - y) - height because (x, y) is the bottom-left corner of the control and not the top-left
 	C.setRect(s.id,
-		C.intptr_t(x), C.intptr_t((winheight - y) - height),
+		C.intptr_t(x), C.intptr_t((winheight-y)-height),
 		C.intptr_t(width), C.intptr_t(height))
 	return nil
 }