NetBpfLoad: better log message on program load failure am: bfc0b6187c

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3250531

Change-Id: I4ec8e134a625a6f6470814f0d7110bf0f3f4ee5a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>