BPF: fix unused parameter warning am: 8ebb223952

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/3195277

Change-Id: I3800d7b0f203782b4fc95504406b6681c335ccee
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>