spec_linux: conform to `golint`
spec_linux: conform to `golint`

Signed-off-by: Vincent Batts <d01a4772f0cffd3f005a7d7f01c59cd104c7a5fe@redhat.com>

wking/opencontainer-runtime-spec,zenlinTechnofreak/specs,vishh/specs,mheon/specs,vbatts/specs,dustymabe/specs,LK4D4/specs,wangkirin/specs,hqhq/specs,ChengTiesheng/specs,opencontainers/runtime-spec,laijs/specs,wking/opencontainer-specs,HardikDR/specs,jonboulle/specs,ujuc/specs,gao-feng/specs,runcom/specs,navidshaikh/specs,kensipe/specs,opencontainers/specs,hqhq/runtime-spec,marcosnils/specs,cloudfoundry-incubator/specs,talwai/specs