cxgb4: fix a NULL dereference

Avoid NULL dereference in setup_sge_queues() when the adapter is
in non offload mode.

Fixes: 0fbc81b3 ('chcr/cxgb4i/cxgbit/RDMA/cxgb4: Allocate resources dynamically for all cxgb4 ULD's')
Signed-off-by: NGanesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

@@ -824,9 +824,12 @@ static int setup_sge_queues(struct adapter *adap)
 {
 	int err, i, j;
 	struct sge *s = &adap->sge;
-	struct sge_uld_rxq_info *rxq_info = s->uld_rxq_info[CXGB4_ULD_RDMA];
+	struct sge_uld_rxq_info *rxq_info = NULL;
 	unsigned int cmplqid = 0;
 
+	if (is_uld(adap))
+		rxq_info = s->uld_rxq_info[CXGB4_ULD_RDMA];
+
 	for_each_port(adap, i) {
 		struct net_device *dev = adap->port[i];
 		struct port_info *pi = netdev_priv(dev);