Fix a bug when an async data buffer fails to load.

research/miniaudio_engine.h

@@ -6714,6 +6714,7 @@ done:
             pDataBuffer->pNode->data.decoded.decodedFrameCount = 0;
         }
 
+        if (result == MA_SUCCESS) {
             /* The job has been set up so it can now be posted. */
             result = ma_resource_manager_post_job(pResourceManager, &pageDataBufferJob);
 
@@ -6721,6 +6722,7 @@ done:
             if (result == MA_SUCCESS) {
                 result = MA_BUSY;
             }
+        }
             
         /* We want to make sure we don't signal the event here. It needs to be delayed until the last page. */
         pJob->loadDataBuffer.pNotification = NULL;