RDMA/hns: Correct the value of srq_desc_size

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

The original value is an integer value less than log2, which
will lead to erroneous calculation. The current value is an
integer value greater than log2.

Feature or Bugfix:Bugfix
Signed-off-by: NWenpeng Liang <liangwenpeng@huawei.com>
Reviewed-by: Nliuyixian <liuyixian@huawei.com>
Reviewed-by: Nliweihang <liweihang@hisilicon.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/infiniband/hw/hns/hns_roce_srq.c

@@ -458,6 +458,7 @@ struct ib_srq *hns_roce_create_srq(struct ib_pd *pd,
 	srq->max_gs = srq_init_attr->attr.max_sge + HNS_ROCE_RESERVED_SGE;
 
 	srq_desc_size = max(HNS_ROCE_SGE_SIZE, HNS_ROCE_SGE_SIZE * srq->max_gs);
+	srq_desc_size = roundup_pow_of_two(srq_desc_size);
 
 	srq->wqe_shift = ilog2(srq_desc_size);