stmmac: use XDP helpers

Make use of the xdp_{init,prepare}_buff() helpers instead of
an open-coded version.

Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matteo Croce 2021-05-14 20:39:52 +02:00 • committed by David S. Miller
commit d172268f93