The ethernet frame length is calculated incorrectly. Depending on
the value of RX_HEAD_PADDING, this may result in ethernet frames
that are too short (cut off at the end), or too long (garbage added
to the end).

Fix by calculating the ethernet frame length correctly. For added
clarity, use the ETH_FCS_LEN constant in the calculation.

Many thanks to Heiner Kallweit for suggesting this solution.
Suggested-by: NHeiner Kallweit <hkallweit1@gmail.com>
Fixes: 3e21a10f ("lan743x: trim all 4 bytes of the FCS; not just 2")
Link: https://lore.kernel.org/lkml/20210408172353.21143-1-TheSven73@gmail.com/Signed-off-by: NSven Van Asbroeck <thesven73@gmail.com>
Reviewed-by: NGeorge McCollister <george.mccollister@gmail.com>
Tested-by: NGeorge McCollister <george.mccollister@gmail.com>
Link: https://lore.kernel.org/r/20210409003904.8957-1-TheSven73@gmail.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>