Merge branch 'sfc-more-ARFS-fixes'

Edward Cree says:

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sfc: more ARFS fixes

A couple more bits of breakage in my recent ARFS and async filters work.
Patch #1 in particular fixes a bug that leads to memory trampling and
 consequent crashes.
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Signed-off-by: David S. Miller <davem@davemloft.net>