RDMA/hns: Fix missing parameter check in set_write_notify_param()

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8NZ4Y



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Add parameter check in set_write_notify_param().

Fixes: 21cacb51 ("RDMA/hns: Support write with notify")
Signed-off-by: Juan Zhou <zhoujuan51@h-partners.com>
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>