!6869 v2 media: v4l2-mem2mem: fix a memleak in v4l2_m2m_register_entity

Merge Pull Request from: @ci-robot 
 
PR sync from: Yipeng Zou <zouyipeng@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/3BXGOIBNFOGNNC5MMOUQ6KWF3EUXNW3S/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9L9JK 
 
Link:https://gitee.com/openeuler/kernel/pulls/6869

 

Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Reviewed-by: Zhang Jianhua <chris.zjh@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>