net: Add inet_proto_csum_replace_by_diff utility function
This function updates a checksum field value and skb->csum based on a value which is the difference between the old and new checksum. Signed-off-by:Tom Herbert <tom@herbertland.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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4b048d6d
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