[17/*] [NET] Replace dst_pmtu with dst_mtu

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

This patch replaces most of the other uses of dst_pmtu with dst_mtu.
As far as I can tell these are either identical because dst->path == dst,
or they're a straightforward replacement of (the slightly incorrect)
dst_pmtu(dst) - dst->header_Len with dst_mtu(dst).

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

At this point the only remaining user of dst_pmtu is ipt_REJECT which
will go away either when we use icmp_send in there or when I replace
it with dst_mtu.

We can now remove the other users of dst->path as well with the removal
of that attribute itself as the goal.
  
Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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