net/sched: act_mirred: Fix leak when redirecting to self on egress

net/sched: act_mirred: Fix leak when redirecting to self on egress

Whenever a mirred redirect to self on egress happens, mirred allocates a
new skb (skb_to_send). The loop to self check was done after that
allocation, but was not freeing the newly allocated skb, causing a leak.

Fix this by moving the if-statement to before the allocation of the new
skb.

The issue was found by running the accompanying tdc test in 2/2
with config kmemleak enabled.
After a few minutes the kmemleak thread ran and reported the leak coming from
mirred.

Fixes: 1d856251a009 ("net/sched: act_mirred: fix loop detection")
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://patch.msgid.link/20260101135608.253079-2-jhs@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>