net: Refactor packet length computations
Save the length when it is computed instead of forgetting it and subtracting pointers to figure it out again. Signed-off-by: NJoe Hershberger <joe.hershberger@ni.com> Acked-by: NSimon Glass <sjg@chromium.org> Acked-by: NMike Frysinger <vapier@gentoo.org>
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