RDMA/hns: Correct the value of srq_desc_size

srq_desc_size should be rounded up to pow of two before used, or related
calculation may cause allocating wrong size of memory for srq buffer.

Fixes: c7bcb13 ("RDMA/hns: Add SRQ support for hip08 kernel mode")
Link: https://lore.kernel.org/r/1572575610-52530-3-git-send-email-liweihang@hisilicon.com
Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Weihang Li <liweihang@hisilicon.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/hns/hns_roce_srq.c

@@ -376,7 +376,7 @@ int hns_roce_create_srq(struct ib_srq *ib_srq,
 	srq->max = roundup_pow_of_two(srq_init_attr->attr.max_wr + 1);
 	srq->max_gs = srq_init_attr->attr.max_sge;
 
-	srq_desc_size = max(16, 16 * srq->max_gs);
+	srq_desc_size = roundup_pow_of_two(max(16, 16 * srq->max_gs));
 
 	srq->wqe_shift = ilog2(srq_desc_size);