clean up exec.c
clean up exec.c

VorontsovIE/streem,lvfeng1130/streem,suzukaze/streem,davydovanton/streem,davydovanton/streem,davydovanton/streem,ShigeruIchinoki/streem,ShigeruIchinoki/streem,matz/streem,0x00evil/streem,lvfeng1130/streem,Ye-Yong-Chi/streem,matz/streem,VorontsovIE/streem,suzukaze/streem,pze/streem,lvfeng1130/streem,ShigeruIchinoki/streem,Ye-Yong-Chi/streem,VorontsovIE/streem,suzukaze/streem,pze/streem,ShigeruIchinoki/streem,Ye-Yong-Chi/streem,0x00evil/streem,pze/streem,Ye-Yong-Chi/streem,davydovanton/streem,lvfeng1130/streem,0x00evil/streem,pze/streem,VorontsovIE/streem,suzukaze/streem,0x00evil/streem