am 745b43c2: Merge "Fix issue 2589563: Able to set ringer volume to 0 outside of silent mode." into froyo

Merge commit '745b43c28fd6bb82c72a15b28be75c55dd115171' into froyo-plus-aosp

* commit '745b43c28fd6bb82c72a15b28be75c55dd115171':
  Fix issue 2589563: Able to set ringer volume to 0 outside of silent mode.