bootctrl: Fix implementation of get_current_slot am: 2af2922e5d
am: c861423217

* commit 'c861423217206eb40e0d05cae59f0d293e7861d6':
  bootctrl: Fix implementation of get_current_slot

Change-Id: Ic9f8054fd3bf67f8b78564ab4571eea2575b3f51