rollback_index: add newline to VB2_DEBUG call

BUG=None
TEST=None

Change-Id: I789caf6fd4410820b9a0c9ef4ed39ad4f4568737
Reviewed-on: https://chromium-review.googlesource.com/1354144
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
1 file changed