Fix possible memory leak with software_16.

If image data is not loaded at all, engine must free associated 32 bit
structure.


SVN revision: 32781

legacy/evas/src/modules/engines/software_16/evas_soft16_main.c

@@ -123,6 +123,7 @@ soft16_image_destroy(Soft16_Image *im)
    if (im->file) evas_stringshare_del(im->file);
    if (im->key) evas_stringshare_del(im->key);
    if (im->free_pixels) free(im->pixels);
+   if (im->source_im) evas_cache_image_drop(im->source_im);
    free(im);
 }