rds: remove redundant variable 'rds_ibdev'

Variable 'rds_ibdev' is being assigned but never used,
so can be removed.

fix this clang warning:
 net/rds/ib_send.c:762:24: warning: variable ‘rds_ibdev’ set but not used [-Wunused-but-set-variable]
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/rds/ib_send.c

@@ -759,14 +759,11 @@ int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op)
 	struct rds_ib_connection *ic = conn->c_transport_data;
 	struct rds_ib_send_work *send = NULL;
 	struct ib_send_wr *failed_wr;
-	struct rds_ib_device *rds_ibdev;
 	u32 pos;
 	u32 work_alloc;
 	int ret;
 	int nr_sig = 0;
 
-	rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
-
 	work_alloc = rds_ib_ring_alloc(&ic->i_send_ring, 1, &pos);
 	if (work_alloc != 1) {
 		rds_ib_stats_inc(s_ib_tx_ring_full);