[automerger skipped] Don't check for FEC offset if fec is disabled am: b5f0996071 -s ours

am skip reason: Merged-In I0e37136313914f1ee9a4eae0e5db59807adc7dc5 with SHA-1 5e5ad39a15 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/update_engine/+/15401790

Change-Id: I0608c32ebce408fff932ce26d838f2d43255c112