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
> 	^
@@ -680,8 +680,7 @@ var criuFeatures *criurpc.CriuFeatures
func (c *linuxContainer) checkCriuFeatures(criuOpts *CriuOpts, rpcOpts *criurpc.CriuOpts, criuFeat *criurpc.CriuFeatures) error {
- var t criurpc.CriuReqType
- t = criurpc.CriuReqType_FEATURE_CHECK
+ t := criurpc.CriuReqType_FEATURE_CHECK
// make sure the features we are looking for are really not from
// some previous check
