Fix bug in recognizing bad image files.

BUG=none
TEST=manual

  make
  make runtests

Change-Id: I8456c25187e01666cc46bad50813e8a4d268f1bc
Reviewed-on: http://gerrit.chromium.org/gerrit/7409
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Tested-by: Bill Richardson <wfrichar@chromium.org>
3 files changed