Merge branch 'netdev_tx_t'

Luc Van Oostenryck says:

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net: always use netdev_tx_t for xmit()'s return type

The ndo_start_xmit() methods should return a 'netdev_tx_t', not
an int, and so should return NETDEV_TX_OK, not 0.
The patches in the series fix most of the remaning drivers and
subsystems (those included in allyesconfig on x86).
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Signed-off-by: David S. Miller <davem@davemloft.net>