Fix a bug in total_data_length am: 4decfcd3b6 am: 53af28b8d4 am: 15e6ac2371 am: 8427b2d330

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2208896

Change-Id: I4c6a73dfa71bafc8ce2961a17596128aaf7ff4a5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>