Use named error return for initProcess#start
Use named error return for initProcess#start

Signed-off-by: zyu <22f3e725b314afeca4d45e12683c560674029d21@gmail.com>

xiaochenshen/runc,estesp/runc,kolyshkin/runc,rhatdan/runc,kolyshkin/runc,opencontainers/runc,mikebrow/runc,xiaochenshen/runc,xiaochenshen/runc,kolyshkin/runc,mikebrow/runc,mikebrow/runc,opencontainers/runc,dqminh/runc,opencontainers/runc,rhatdan/runc,estesp/runc,kolyshkin/runc,dqminh/runc,estesp/runc,rhatdan/runc,dqminh/runc,dqminh/runc,opencontainers/runc,rhatdan/runc