Fixed infinite loop inside verity write and --disable_fec_computation am: 701cb6f654 am: 0583240c61

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2467467

Change-Id: I1c39e6c4b05a74395bddbc8ca8a475859a125b39
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>