mm-dash: Exit scansources if source is null

If mSource was destroyed and postScanSources
is running results in crash as null source
instance is accessed.

Change to break out of scanSources loop.
Later when source setup and started scanSources
is posted again.

Change-Id: I573212eee62a0f2e2aff23cc49b1f5e38896c2ea
1 file changed
tree: 484b310867f0f7b3e8282594daf1ca6902668ab4
  1. dashplayer/
  2. QCMediaPlayer/
  3. Android.mk