am ff119e74: am 6615defd: Make sure the OMX callback thread is properly shutdown after the node goes away.

Merge commit 'ff119e746afe834040afb1631caee355d94237e8'

* commit 'ff119e746afe834040afb1631caee355d94237e8':
  Make sure the OMX callback thread is properly shutdown after the node goes away.