CCodec: fix resource releases

PipelineWatcher holds input buffer references --- it must be
flushed to release buffers properly.

Bug: 155520767
Test: manual
Test: atest CtsMediaTestCases -- --module-arg CtsMediaTestCases:size:small
Change-Id: I2ef7f266b6f91063e3f1da5019859cb3a178ec0b
1 file changed