Fixes per Vigilant Sentry (http://www.vigilantsw.com/)

* Fix memory leaks.

* Add comments about initializations and checking for successful results.

* Add checks for NULL deref.

* Consistency in "TODO" vs "TO-DO" comments!

src/ondemand/ODWaveTrackTaskQueue.cpp

@@ -225,6 +225,7 @@ WaveTrack* ODWaveTrackTaskQueue::GetWaveTrack(size_t x)
 {
    WaveTrack* ret = NULL;
    mTracksMutex.Lock();
+   // FIX-ME: x is unsigned so there's no point in checking that it's >= 0.
    if(x>=0&&x<mTracks.size())
       ret = mTracks[x];
    mTracksMutex.Unlock();
@@ -256,6 +257,7 @@ ODTask* ODWaveTrackTaskQueue::GetTask(size_t x)
 {
    ODTask* ret = NULL;
    mTasksMutex.Lock();
+   // FIX-ME: x is unsigned so there's no point in checking that it's >= 0.
    if(x>=0&&x<mTasks.size())
       ret = mTasks[x];
    mTasksMutex.Unlock();