RDMA/hns: fix potential integer overflow on left shift

There is a potential integer overflow when int i is left shifted as this
is evaluated using 32 bit arithmetic but is being used in a context that
expects an expression of type dma_addr_t.  Fix this by casting integer i
to dma_addr_t before shifting to avoid the overflow.

Addresses-Coverity: ("Unintentional integer overflow")
Fixes: 2ac0bc5e ("RDMA/hns: Add a group interfaces for optimizing buffers getting flow")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/hns/hns_roce_alloc.c

@@ -257,7 +257,7 @@ int hns_roce_get_kmem_bufs(struct hns_roce_dev *hr_dev, dma_addr_t *bufs,
 	for (i = start; i < end; i++)
 		if (buf->nbufs == 1)
 			bufs[total++] = buf->direct.map +
-					(i << buf->page_shift);
+					((dma_addr_t)i << buf->page_shift);
 		else
 			bufs[total++] = buf->page_list[i].map;