Fix an error with the previous commit.

miniaudio.h

@@ -70063,8 +70063,10 @@ MA_API ma_result ma_engine_init(const ma_engine_config* pConfig, ma_engine* pEng
         */
         #if !defined(MA_NO_DEVICE_IO)
         {
+            if (pEngine->pDevice != NULL) {
                 listenerConfig.pChannelMapOut = pEngine->pDevice->playback.channelMap;
             }
+        }
         #endif
 
         result = ma_spatializer_listener_init(&listenerConfig, &pEngine->allocationCallbacks, &pEngine->listeners[iListener]);  /* TODO: Change this to a pre-allocated heap. */