net/sched: act_mirred: Fix return code in early mirred redirect error paths

net/sched: act_mirred: Fix return code in early mirred redirect error paths

Since retval is set as TC_ACT_STOLEN in the mirred redirect case, returning
retval in cases where redirect failed will make the callers not register
the skb as being dropped.

Fix this by returning TC_ACT_SHOT instead in such scenarios.

Fixes: 16085e48cb48 ("net/sched: act_mirred: Create function tcf_mirred_to_dev and improve readability")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://sashiko.dev/#/patchset/20260413082027.2244884-1-hxzene%40gmail.com
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Link: https://patch.msgid.link/20260525122556.973584-8-jhs@mojatatu.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>