seg6: fix the iif in the IPv6 socket control block

seg6: fix the iif in the IPv6 socket control block

This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven.
This ID is fixed in Linux Kernel version v5.10.85 by commit 666521b3852d2b2f52d570f9122b1e4b50d96831, it was introduced in version v5.0 by commit ef489749aae508e6f17886775c075f12ff919fb1. For more details please see the references link.