net/sched: act_skbmod: remove unneeded rcu_read_unlock in tcf_skbmod_dump

net/sched: act_skbmod: remove unneeded rcu_read_unlock in tcf_skbmod_dump

BugLink: http://bugs.launchpad.net/bugs/1675032
[ Upstream commit 6c4dc75c251721f517e9daeb5370ea606b5b35ce ]

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>