dccp: Combine the functionality of enqeueing and cloning
Realising the following call pattern,
* first dccp_entail() is called to enqueue a new skb and
* then skb_clone() is called to transmit a clone of that skb,
this patch integrates both interrelated steps into dccp_entail().
Note: the return value of skb_clone is not checked. It may be an idea to add a
warning if this occurs. In both instances, however, a timer is set for
retransmission, so that cloning is re-tried via dccp_retransmit_skb().
Signed-off-by: NGerrit Renker <gerrit@erg.abdn.ac.uk>
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