ipvs: fix WARNING in ipvsappnetcleanup()
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 v5.15.78 by commit 06d7596d18725f1a93cf817662d36050e5afb989, it was introduced in version v2.6.24 by commit 457c4cbc5a3dde259d2a1f15d5f9785290397267. For more details please see the references link.