IB/rdmavt: Use struct_size() helper

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes, in particular in the
context in which this code is being used.

So, replace the following form:

sizeof(struct rvt_sge) * init_attr->cap.max_send_sge + sizeof(struct rvt_swqe)

with:

struct_size(swq, sg_list, init_attr->cap.max_send_sge)

and so on...

Also, notice that variable size is unnecessary, hence it is removed.

This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/sw/rdmavt/qp.c

@@ -988,9 +988,7 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd,
 	case IB_QPT_UC:
 	case IB_QPT_RC:
 	case IB_QPT_UD:
-		sz = sizeof(struct rvt_sge) *
-			init_attr->cap.max_send_sge +
-			sizeof(struct rvt_swqe);
+		sz = struct_size(swq, sg_list, init_attr->cap.max_send_sge);
 		swq = vzalloc_node(array_size(sz, sqsize), rdi->dparms.node);
 		if (!swq)
 			return ERR_PTR(-ENOMEM);