cls_flower: Fix incorrect idr release when failing to modify rule
When we fail to modify a rule, we incorrectly release the idr handle of the unmodified old rule. Fix that by checking if we need to release it. Fixes: fe2502e4 ("net_sched: remove cls_flower idr on failure") Reported-by: NVlad Buslov <vladbu@mellanox.com> Reviewed-by: NRoi Dayan <roid@mellanox.com> Acked-by: NJiri Pirko <jiri@mellanox.com> Signed-off-by: NPaul Blakey <paulb@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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