Fix crash on ota_extractor am: 93e3810b0c am: 4e54b254b0 am: 3a0abd0b47

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2063610

Change-Id: Id01ee7144658c2bbf7a91363bbb1c5c81386b76f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>