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It seems that the getifaddrs() function can return interfaces with IFF_BROADCAST & IFF_UP set, but no broadcast address (at least under Cygwin 1.7, this seems to happen for v6 mapped v4 addresses) Avoid a null dereference if this ever happens Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk> Reviewed-by: Colin Harrison <colin.harrison@virgin.net>