RDMA/core: Fix order of nldev_exit call

Create symmetrical exit flow by calling to nldev_exit() after
call to rdma_nl_unregister(RDMA_NL_LS).

Fixes: 6c80b41a ("RDMA/netlink: Add nldev initialization flows")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/64e676774a53a406f4cde265d5a4cfd6b8e97df9.1666683334.git.leonro@nvidia.comSigned-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/core/device.c

@@ -2843,8 +2843,8 @@ static int __init ib_core_init(void)
 static void __exit ib_core_cleanup(void)
 {
 	roce_gid_mgmt_cleanup();
-	nldev_exit();
 	rdma_nl_unregister(RDMA_NL_LS);
+	nldev_exit();
 	unregister_pernet_device(&rdma_dev_net_ops);
 	unregister_blocking_lsm_notifier(&ibdev_lsm_nb);
 	ib_sa_cleanup();