ipv6: sr: make seg6.h includable without IPv6
include/net/seg6.h cannot be included in a source file if CONFIG_IPV6 is not enabled: include/net/seg6.h: In function 'seg6_pernet': >> include/net/seg6.h:52:14: error: 'struct net' has no member named 'ipv6'; did you mean 'ipv4'? return net->ipv6.seg6_data; ^~~~ ipv4 This commit makes seg6_pernet return NULL if IPv6 is not compiled, hence allowing seg6.h to be included regardless of the configuration. Signed-off-by: NMathieu Xhonneux <m.xhonneux@gmail.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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