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/net/switchdev/Kconfig

#
# Configuration for Switch device support
#

config NET_SWITCHDEV
	bool "Switch (and switch-ish) device support"
	depends on INET
	---help---
	  This module provides glue between core networking code and device
	  drivers in order to support hardware switch chips in very generic
	  meaning of the word "switch". This include devices supporting L2/L3 but
	  also various flow offloading chips, including switches embedded into
	  SR-IOV NICs.