stable-rc 4.14 : net/ipv6/addrconf.c:6593:22: error: 'blackhole_netdev' undeclared

[Naresh Kamboju]

stable-rc 4.14 for architectures arm64, arm, x86_64 and i386 builds
failed due to below error,

net/ipv6/addrconf.c: In function 'addrconf_init':
net/ipv6/addrconf.c:6593:22: error: 'blackhole_netdev' undeclared
(first use in this function); did you mean 'alloc_netdev'?
  bdev = ipv6_add_dev(blackhole_netdev);
                      ^~~~~~~~~~~~~~~~
                      alloc_netdev
net/ipv6/addrconf.c:6593:22: note: each undeclared identifier is
reported only once for each function it appears in
net/ipv6/addrconf.c: In function 'addrconf_cleanup':
net/ipv6/addrconf.c:6667:18: error: 'blackhole_netdev' undeclared
(first use in this function); did you mean 'alloc_netdev'?
  addrconf_ifdown(blackhole_netdev, 2);
                  ^~~~~~~~~~~~~~~~
                  alloc_netdev

Build link,
https://ci.linaro.org/view/lkft/job/openembedded-lkft-linux-stable-rc-4.14/DISTRO=lkft,MACHINE=intel-corei7-64,label=docker-lkft/632/consoleText

- Naresh