hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I569U8
CVE: NA

Reference: https://lore.kernel.org/lkml/20190609164147.971147667@linuxfoundation.org/

--------------------------------

The digest() hook relies on a crc value from the shash_desc context.
However, this context is not initialized while digest() hook is called,
and an arbitrary value is read causing the algorithm generating wrong
result.

This patch fixes this issue by passing a 0 as the initial crc value in
the digest() hook.
Signed-off-by: NGUO Zihua <guozihua@huawei.com>
Reviewed-by: NYue Haibing <yuehaibing@huawei.com>
Reviewed-by: NWang Weiyang <wangweiyang2@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>