net: freescale: fix return type of ndo_start_xmit function

net: freescale: fix return type of ndo_start_xmit function

[ Upstream commit 06983aa526c759ebdf43f202d8d0491d9494e2f4 ]

The method ndo_start_xmit() is defined as returning an 'netdev_tx_t',
which is a typedef for an enum type, so make sure the implementation in
this driver has returns 'netdev_tx_t' value, and change the function
return type to netdev_tx_t.

Found by coccinelle.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>