[PATCH net-next] net: broadcom: fix return type of ndo_start_xmit function

From: YueHaibing <redacted>
Date: Wed, 19 Sep 2018 18:45:12 +0800

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 <redacted>

Applied.