in iOS/WAStickersThirdParty/YYImageCoder.m [385:392]
static void yy_png_info_release(yy_png_info *info) {
if (info) {
if (info->chunks) free(info->chunks);
if (info->apng_frames) free(info->apng_frames);
if (info->apng_shared_chunk_indexs) free(info->apng_shared_chunk_indexs);
free(info);
}
}