crypto: hisilicon/qm - delete redundant null assignment operations

mainline inclusion
from mainline-v6.2-rc1
commit 7bbbc9d8
category: feature
bugzilla: https://gitee/com/openeuler/kernel/issues/16VW8E
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7bbbc9d81be588ae4fb28b5b202e4421dbfef197



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There is no security data in the pointer. It is only a value transferred
as a structure. It makes no sense to zero a variable that is on the stack.
So not need to set the pointer to null.

Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: JangShui <yangjiangshui@h-partners.com>