lib : kobject: fix refcount imblance on kobject_rename

mainline inclusion
from mainline-v5.3-rc1
commit 122f8ec7
category: bugfix
bugzilla: 18462
CVE: NA

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the kobj refcount increased by kobject_get should be released before
error return, otherwise lead to a memory leak.

Signed-off-by: Lin Yi <teroincn@163.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Li Heng <liheng40@huawei.com>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>