myri10ge: remove over-paranoid queue number modulus

No need to modulus the queue number in ->hard_start_xmit() since the
core is going to do that for you modulus ->real_num_tx_queues.

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: David S. Miller <davem@davemloft.net>