[klone] io_t codecs return values stricter check
[klone] io_t codecs return values stricter check

koanlogic/klone,larsthegeek/klone,xunmengfeng/klone,larsthegeek/klone,koanlogic/klone,koanlogic/klone,larsthegeek/klone,xunmengfeng/klone