net: honour netif_set_real_num_tx_queues() retval
In netif_copy_real_num_queues() the return value of netif_set_real_num_tx_queues() should be checked. Signed-off-by: NJiri Pirko <jiri@resnulli.us> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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