[DCCP]: Reorganize struct dccp_sock to save 8 bytes

/home/acme/git/net-2.6/net/dccp/ipv6.c:
  struct dccp_sock  |   -8
  struct dccp6_sock |   -8
 2 structs changed

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>