iser-target: Avoid isert_conn->cm_id dereference in isert_login_recv_done

This patch fixes a NULL pointer dereference in isert_login_recv_done()
of isert_conn->cm_id due to isert_cma_handler() -> isert_connect_error()
resetting isert_conn->cm_id = NULL during a failed login attempt.

As per Sagi, we will always see the completion of all recv wrs posted
on the qp (given that we assigned a ->done handler), this is a FLUSH
error completion, we just don't get to verify that because we deref
NULL before.

The issue here, was the assumption that dereferencing the connection
cm_id is always safe, which is not true since:

    commit 4a579da2
    Author: Sagi Grimberg <sagig@mellanox.com>
    Date:   Sun Mar 29 15:52:04 2015 +0300

         iser-target: Fix possible deadlock in RDMA_CM connection error

As I see it, we have a direct reference to the isert_device from
isert_conn which is the one-liner fix that we actually need like
we do in isert_rdma_read_done() and isert_rdma_write_done().
Reported-by: Andrea Righi <righi.andrea@gmail.com>
Tested-by: Andrea Righi <righi.andrea@gmail.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Cc: <stable@vger.kernel.org> # 3.10+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/infiniband/ulp/isert/ib_isert.c

@@ -1452,7 +1452,7 @@ static void
 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
 {
 	struct isert_conn *isert_conn = wc->qp->qp_context;
-	struct ib_device *ib_dev = isert_conn->cm_id->device;
+	struct ib_device *ib_dev = isert_conn->device->ib_device;
 
 	if (unlikely(wc->status != IB_WC_SUCCESS)) {
 		isert_print_wc(wc, "login recv");