am c4554b9a: Keep track of remaining fd when devices are removed

Merge commit 'c4554b9a0885ac3713575e91d8d33c5670b52322' into gingerbread-plus-aosp

* commit 'c4554b9a0885ac3713575e91d8d33c5670b52322':
  Keep track of remaining fd when devices are removed