Delete unused variable

Signed-off-by: Xiaobing.Jiang <[email protected]>

Author: s7v7nislands

utils_linux.go

@@ -27,8 +27,6 @@ import (
 
 var errEmptyID = errors.New("container id cannot be empty")
 
-var container libcontainer.Container
-
 // loadFactory returns the configured factory instance for execing containers.
 func loadFactory(context *cli.Context) (libcontainer.Factory, error) {
 	root := context.GlobalString("root")