[automerge] libfdt: fdt_path_offset_namelen: Reject empty paths 2p: a6ac6d916d 2p: c69e9730e6 am: 5b78ca8410

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/dtc/+/20024810

Change-Id: If03db4f51e74c1166de322128c477218fac6a000
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>