1192437968 -0700
committer David S. Miller <davem@sunset.davemloft.net> 1192476393 -0700

[NET]: Fix csum_start update in pskb_expand_head

I got confused by the dual nature of the off variable in the
function pskb_expand_head.  The csum_start offset should use
nhead instead of off which can change depending on whether we
are using offsets or pointers.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
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