RDMA/mana_ib: Fix missing ret value

Set ret to -ENODEV when netdev_master_upper_dev_get_rcu returns NULL.

Fixes: 8b184e4f1c ("RDMA/mana_ib: Enable RoCE on port 1")
Link: https://lore.kernel.org/r/1713881751-21621-1-git-send-email-kotaranov@linux.microsoft.com
Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/mana/device.c

@@ -87,6 +87,7 @@ static int mana_ib_probe(struct auxiliary_device *adev,
 	upper_ndev = netdev_master_upper_dev_get_rcu(mc->ports[0]);
 	if (!upper_ndev) {
 		rcu_read_unlock();
+		ret = -ENODEV;
 		ibdev_err(&dev->ib_dev, "Failed to get master netdev");
 		goto free_ib_device;
 	}