BpfMapTest: fixes for testGetFd am: 878aae0856 am: f57637edea

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3134197

Change-Id: I92c96e126648b3f0723ceb1c6c1481ff06f5d265
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>