Fix possible double-free of flow table entry#788
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If flow table insertion fails, the rollback code has a bug. Due to the nature of
dp_delete_flow()which callsdp_ref_dec(), the flow value would already be freed by the reference counter hitting zero.But
dp_delete_flow()can actually fail, so the result needs to be passed to the caller to decide ifrte_valstill remains to be freed or not.Connected to issue #784