StructNlAttrTest: fix lint error am: d7b866df70 am: 5e4a284bd9

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

Change-Id: I4f7fe6662e36d89a0f4453150a2b32d6686a3ab9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>