datagram: Factor out sk queue referencing

commit 4934b0329f7150dcb5f90506860e2db32274c755 upstream.

This makes lines shorter and simplifies further patching.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Prerequisite of "net: Clone skb before setting peeked flag"]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --cc net/core/datagram.c
Simple merge