[automerger skipped] storaged: Avoid divide-by-zero in performance measurement am: 84b7ca8d -s ours am: 4533deb6 -s ours

am skip reason: Merged-In Idec0052f534dc4abb81a414ca76f6c11f4a4dded with SHA-1 5a02a9ba is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/18620177



Change-Id: I462168905324d78299c2446d516eef6e234ed627
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>