RDMA/hns: Prevent memory leaks of eq->buf_list

eq->buf_list->buf and eq->buf_list should also be freed when eqe_hop_num
is set to 0, or there will be memory leaks.

Fixes: a5073d6 ("RDMA/hns: Add eq support of hip08")
Link: https://lore.kernel.org/r/1572072995-11277-3-git-send-email-liweihang@hisilicon.com
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Weihang Li <liweihang@hisilicon.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -5389,9 +5389,9 @@ static void hns_roce_v2_free_eq(struct hns_roce_dev *hr_dev,
 		return;
 	}
 
-	if (eq->buf_list)
-		dma_free_coherent(hr_dev->dev, buf_chk_sz,
-				  eq->buf_list->buf, eq->buf_list->map);
+	dma_free_coherent(hr_dev->dev, buf_chk_sz, eq->buf_list->buf,
+			  eq->buf_list->map);
+	kfree(eq->buf_list);
 }
 
 static void hns_roce_config_eqc(struct hns_roce_dev *hr_dev,