!3786 ubi: block: fix memleak in ubiblock_create()

Merge Pull Request from: @ci-robot 
 
PR sync from: Li Nan <linan122@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/AJPWAFOBK7VXIPI5LE32LRL66DF5LEUR/ 
 
https://gitee.com/openeuler/kernel/issues/I8P68G 
 
Link:https://gitee.com/openeuler/kernel/pulls/3786

 

Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>