am 22d79a5c: make offsets in firmware update header not point to bad blocks

Merge commit '22d79a5c5eab9c1e86ff2af210bb072689e2d630' into eclair-plus-aosp

* commit '22d79a5c5eab9c1e86ff2af210bb072689e2d630':
  make offsets in firmware update header not point to bad blocks