CVE-2026-31526 bpf: Fix exception exit lock checking for subprogs

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix exception exit lock checking for subprogs processbpfexitfull passes checklock = !curframe to checkresourceleak, which is false in cases when bpfthrow is called from a static subprog. This makes checkresourceleak to skip...