netfilter: nf_tables: Eliminate duplicated code in nf_tables_table_enable()

If something fails in nf_tables_table_enable(), it unregisters the
chains. But the rollback code is the same as nf_tables_table_disable()
almostly, except there is one counter check.  Now create one wrapper
function to eliminate the duplicated codes.

Signed-off-by: Feng <fgao@ikuai8.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

path: root/include/net/tc_act/tc_defact.h

#ifndef __NET_TC_DEF_H
#define __NET_TC_DEF_H

#include <net/act_api.h>

struct tcf_defact {
	struct tc_action	common;
	u32		tcfd_datalen;
	void		*tcfd_defdata;
};
#define to_defact(a) ((struct tcf_defact *)a)

#endif /* __NET_TC_DEF_H */