!6510 cachefiles: fix memory leak in cachefiles_add_cache()

Merge Pull Request from: @ci-robot 
 
PR sync from: Baokun Li <libaokun1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/B4P4APYA5M6RGRGRETUTDBXWGE3W26GT/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9HJVQ 
 
Link:https://gitee.com/openeuler/kernel/pulls/6510

 

Reviewed-by: Hou Tao <houtao1@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>