[automerge] libfdt: fdt_path_offset_namelen: Reject empty paths 2p: a6ac6d916d am: bfb9c7cab7 am: 952da991f4 am: 2d6c51c1d2

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

Change-Id: I571356394316830dd61581ca85f55b7f07dfce5a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>