netfilter: Fix format string of nfnetlink_log proc file
The printed values are all of type unsigned integer, therefore use %u instead of %d. Otherwise an user can face negative values. Signed-off-by: Richard Weinberger <richard@nod.at> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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