NetBpfLoad: don't log the program failure buffer if it is empty am: 9f8b17ee5b am: 5dd97de152

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3250532

Change-Id: I05d4741f4731b18905757177c14876cda5f01c23
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>