libct/checkCriuFeatures: fix gosimple linter warning
libct/checkCriuFeatures: fix gosimple linter warning

> libcontainer/container_linux.go:683:2: S1021: should merge variable declaration with assignment on next line (gosimple)
> 	var t criurpc.CriuReqType
> 	^

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

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