hal: Add NULL check for PCM streams in pass though module

- HAL restart is observed for PCM stream playback
  over display port

- Codec info is not available for PCM stream on updating
  passthough type

- Add NULL check while updating stream configuration
  on pass through module

Change-Id: If8b0f6757610535aa079b88abfa505d5cd1a6e31
1 file changed