Merge branch 'sock-cookie-initializers'

Willem de Bruijn says:

====================
sock cookie initializers

Recent UDP GSO and SO_TXTIME features added new fields to cookie
structs.

When adding a field, all sites where a struct is initialized have to
be updated, which is a lot of boilerplate. Alternatively, a field can
be initialized selectively, but this is fragile. I introduced a bug
in udp gso where an uninitialized field was read. See also fix commit
("9887cba19978 ip: limit use of gso_size to udp").

Introduce initializers for structs ipcm(6)_cookie and sockc_cookie.

patch 1..3 do exactly this.
patch 4..5 make ipv4 and ipv6 handle cookies the same way and
           remove some boilerplate in doing so.
patch 6    removes the udp gso branch that needed the above fix
====================

Signed-off-by: David S. Miller <davem@davemloft.net>