dccp: do not leak jiffies on the wire

For some reason I missed the case of DCCP passive
flows in my previous patch.

Fixes: a904a069 ("inet: stop leaking jiffies on the wire")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Thiemo Nagel <tnagel@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>