[DCCP]: Simplify skb_set_owner_w semantics

While we're at it let's reorganise the set_owner_w calls a little so that:

1) dccp_transmit_skb sets the owner for all packets except data packets.
2) Add dccp_skb_entail to set owner for packets queued for retransmission.
3) Make dccp_transmit_skb static.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

diff --cc net/dccp/dccp.h
Simple merge

diff --cc net/dccp/output.c
Simple merge