tcf_em_tree_validate
int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &f->ematches);
err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &new->ematches);
err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &fnew->ematches);
EXPORT_SYMBOL(tcf_em_tree_validate);