Give additional info why blkid might be using a loop device after umount

Added set -v so that you know what output you're seeing and what it
means without having to dig up the code.

BUG=chromium:337490
TEST=tried from the command line

Change-Id: I6d9020a221a7098f5b7bf743589f803c02eea95f
Reviewed-on: https://chromium-review.googlesource.com/189488
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Marc MERLIN <merlin@chromium.org>
1 file changed