netfilter: add missing IS_ENABLED(CONFIG_NF_TABLES) check to header-file.
commit 47e640af upstream. nf_tables.h defines an API comprising several inline functions and macros that depend on the nft member of struct net. However, this is only defined is CONFIG_NF_TABLES is enabled. Added preprocessor checks to ensure that nf_tables.h will compile if CONFIG_NF_TABLES is disabled. Signed-off-by: Jeremy Sowden <jeremy@azazel.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Link: https://lore.kernel.org/netfilter-devel/20190920094925.aw7actk4tdnk3rke@salvia/T/ Fixes: 3c171f49 ("netfilter: bridge: add connection tracking system") Reported-by: Adam Borowski <kilobyte@angband.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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