block: Fix the kabi change in device_add_disk

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I81XCK



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Fix the kabi change caused by changing the return value of
device_add_disk.

Signed-off-by: Zhong Jinghua <zhongjinghua@huawei.com>
Signed-off-by: Li Nan <linan122@huawei.com>
(cherry picked from commit 1f663b6b)