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 v5.4.165 by commit ef8804e47c0a44ae106ead1740408af5ea6c6ee9, it was introduced in version v5.0 by commit ef489749aae508e6f17886775c075f12ff919fb1. For more details please see the references link.