net: ethernet: Fix length update for unsupported packet families
Do not update packet length for unsupported packet families.
AF_PACKET family used the IPv6 length update, which breaks the
packet length if there is a payload with bytes resembling a
IPv6 length field less then 6 or a IPv4 length field less
then 46.
Signed-off-by:
Christoph Seitz <christoph.seitz@infineon.com>
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