am c4a7d89c: Fix potential memory leak from video mio WM is still using the old video MIO to do rendering Over the test, I did not see it leaks, but it does not hurt to add a check.

Merge commit 'c4a7d89cde4516ce35cf92eb6467003b97331f8f' into froyo-plus-aosp

* commit 'c4a7d89cde4516ce35cf92eb6467003b97331f8f':
  Fix potential memory leak from video mio