net_sched: fix a use-after-free in sfq
net_sched: fix a use-after-free in sfq

Fixes: 25331d6ce42b ("net: sched: implement qstat helper routines")
Cc: John Fastabend <ee461b60978bea1c76b3018c0b89685175b248e2@gmail.com>
Signed-off-by: Cong Wang <0f114804888b88d50037b04b42e57b858d851b87@gmail.com>
Signed-off-by: Cong Wang <2b3b59efb30d692c772b2f93c636eba69bba4f54@twopensource.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs