crypto: hisilicon/sec - fix for resource leak

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7BANJ


CVE: NA

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The hisi_acc_sg_buf_unmap function is not executed
before return ret, causing resource leakage.

Signed-off-by: Wenkai Lin <linwenkai6@hisilicon.com>
Signed-off-by: JiangShui Yang <yangjiangshui@h-partners.com>