Clear singleton reference during JetPlayer.release()
Clear singleton reference during JetPlayer.release()

Only one JetPlayer instance is supported at a time. A singleton reference is
created and returned in JetPlayer.getInstance(). When calling release() on the
instance, the corresponding native player is finalized.  Therefore, release()
must also clear the singleton reference, so that any subsequent call to
getInstance() re-initializes the native player.

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base