The padding intended to avoid corrupted non-zero padding payload was
accidentally adding too many padding bytes, tripping up some setups.
Fix this by using eth_skb_pad instead.
Fixes#11942.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 9307c27539805de021fb7163f6ad6dc08992331b)