Revert an experimental change.

research/ma_engine.h

@@ -5361,12 +5361,8 @@ static void ma_engine_mix_sound(ma_engine* pEngine, ma_sound_group* pGroup, ma_s
 
                 /* If we reached the end of the sound we'll want to mark it as at the end and stop it. This should never be returned for looping sounds. */
                 if (result == MA_AT_END) {
-                    if (pSound->isLooping) {
-                        ma_sound_seek_to_pcm_frame(pSound, 0);
-                    } else {
-                        ma_sound_stop_internal(pSound);
-                        c89atomic_exchange_32(&pSound->atEnd, MA_TRUE); /* This will be set to false in ma_sound_start(). */
-                    }
+                    ma_sound_stop_internal(pSound);
+                    c89atomic_exchange_32(&pSound->atEnd, MA_TRUE); /* This will be set to false in ma_sound_start(). */
                 }
 
                 pSound->runningTimeInEngineFrames += offsetInFrames + framesProcessed;