Split switch, shift cases to the left, fix most lines beyond column 80.

Prepare (future) error return.

Requires:
   TCPCT part 1g: Responder Cookie => Initiator
   net: tcp_header_len_th and tcp_option_len_th

Signed-off-by: William.Allen.Simpson@gmail.com
---
  include/net/tcp.h        |    3 +-
  net/ipv4/syncookies.c    |    5 +-
  net/ipv4/tcp_input.c     |  217 ++++++++++++++++++++++++++--------------------
  net/ipv4/tcp_ipv4.c      |   10 ++-
  net/ipv4/tcp_minisocks.c |   14 ++-
  net/ipv6/syncookies.c    |    5 +-
  net/ipv6/tcp_ipv6.c      |    6 +-
  7 files changed, 154 insertions(+), 106 deletions(-)