net: sched: gred: use extack to provide more details on configuration errors
Add extack messages to -EINVAL errors, to help users identify their mistakes. Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: NJohn Hurley <john.hurley@netronome.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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