tree cf05f8851316ab937e2c282ae074e4f43d66f464
parent e43d699cfe07196c08a18141160791ae187c1d70
author z3DD3r <z3dd3r@gmail.com> 1583314930 +0300
committer z3DD3r <z3dd3r@gmail.com> 1583314930 +0300

backuptool: Properly unmount system partition

For non AB devices system partition should be unmounted
if check_prereq function fails.

This patch also refactors backuptool a bit for AB devices
in order to look same as backuptool for non AB devices.

Change-Id: Ia1f4ae95c9e4dae4df844853e81c264bc838f177