ble_adv example: Remove int return value from app_main()

examples/05_ble_adv/main/app_bt.c

@@ -197,10 +197,9 @@ void bleAdvtTask(void *pvParameters)
     }
 }
 
-int app_main()
+void app_main()
 {
     bt_controller_init();
     xTaskCreatePinnedToCore(&bleAdvtTask, "bleAdvtTask", 2048, NULL, 5, NULL, 0);
-    return 0;
 }