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Every flow_offload entry is added into the table twice. Because of this, rhashtable_free_and_destroy can't be used, since it would call kfree for each flow_offload object twice. This patch cleans up the flowtable via nf_flow_table_iterate() to schedule removal of entries by setting on the dying bit, then there is an explicitly invocation of the garbage collector to release resources. Based on patch from Felix Fietkau. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>