am 090c60bb: Merge change I73b60354 into eclair

Merge commit '090c60bb9d6608df4a8d753fc91974fe2c49c262' into eclair-mr2

* commit '090c60bb9d6608df4a8d753fc91974fe2c49c262':
  AudioFlinger: delete Track object when createTrack() fails due to lack of tracks in AudioMixer.