c
<   if (cinfo->out_color_space == JCS_GRAYSCALE) {
---
>   switch (cinfo->out_color_space) {
>   case JCS_GRAYSCALE:
>       ...
>   case JCS_RGB565:
>       ...
>   default:
>       ERREXIT(cinfo, JERR_BAD_CMAP);
>   }
