CVE-2024-38612 ipv6: sr: fix invalid unregister error path

In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: fix invalid unregister error path The error path of seg6init is wrong in case CONFIGIPV6SEG6LWTUNNEL is not defined. In that case if seg6hmacinit fails, the genlunregisterfamily isn't called. This issue exist since comm...