StructNlAttrTest: fix lint error am: d7b866df70

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3135307

Change-Id: If77caaa97a1e7d557bd3714f5bbe88b52a6ccfd2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>