vboot: fix a typo in CL:2112321

CL:2112321 inadvertently removed the escape on a \n newline
in a VB2_DEBUG string.  Put it back.

BUG=b:124141368, chromium:968464
TEST=make clean && make runtests
BRANCH=none

Change-Id: I19ee4a77d3cc58d6995212151b381ae76c602a42
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2174039
Reviewed-by: Hsuan Ting Chen <roccochen@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
Tested-by: Joel Kitching <kitching@chromium.org>
1 file changed