BpfNetMaps - minor jni code fixups am: 932ef5b220

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2104865

Change-Id: I6cacd16014ff4ca667986d663e375fe6e3e1ffd8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>