Properly report an error for download action write errors am: 430852dc7b am: 1049144d64

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2605637

Change-Id: Iea2b169b29d0503ea6491f0fd6fe65d80b813f38
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>