ipv6: fix locking issues with loops over idev->addr_list
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 v5.4.198 by commit 4460066eb2480b9e203c73755e12e2efc820a27e. For more details please see the references link.