PRESUBMIT: don't enter the chroot

The presubmit has to be run from inside the chroot in order to have
access to the tnull binary anyway. If you call cros_sdk from inside the
chroot, you just get a failure.

BUG=chromium:1127071
TEST=local run

Change-Id: Ifccaeddb14328d2d813895400682820693b29467
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/tnull/+/2488842
Reviewed-by: Prathmesh Prabhu <pprabhu@google.com>
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
Tested-by: Sean Abraham <seanabraham@chromium.org>
1 file changed