losetup -d does not always seem to work. Try it more than once.

BUG=chromium:337490
TEST=cbuildbot arm-generic-full

Change-Id: Iefe12363508e15a7eb5472e2f442fdce759bd94a
Reviewed-on: https://chromium-review.googlesource.com/189275
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Marc MERLIN <merlin@chromium.org>
Tested-by: Marc MERLIN <merlin@chromium.org>
1 file changed