bpf: Skip invalid kfunc call in backtrack_insn
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 v5.15.93 by commit 6e2fac197de2c4c041bdd8982cffb104689113f1. For more details please see the references link.