RDMA/cxgb4: Fix over-dereference when terminating

Need to get the endpoint reference before calling rdma_fini(), which
might fail causing us to not get the reference.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/cxgb4/qp.c

@@ -1389,14 +1389,14 @@ int c4iw_modify_qp(struct c4iw_dev *rhp, struct c4iw_qp *qhp,
 			qhp->attr.ecode = attrs->ecode;
 			ep = qhp->ep;
 			disconnect = 1;
+			c4iw_get_ep(&qhp->ep->com);
 			if (!internal)
 				terminate = 1;
 			else {
 				ret = rdma_fini(rhp, qhp, ep);
 				if (ret)
 					goto err;
 			}
-			c4iw_get_ep(&qhp->ep->com);
 			break;
 		case C4IW_QP_STATE_ERROR:
 			t4_set_wq_in_error(&qhp->wq);