IB/mlx4: Don't register IB device for adapters with no IB ports
If the mlx4_ib driver finds an adapter that has only ethernet ports, the
current code will register an IB device with 0 ports. Nothing useful or
sensible can be done with such a device, so just skip registering it.
Signed-off-by: NRoland Dreier <rolandd@cisco.com>
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