small fix for android build

Cargo.lock

@@ -3430,7 +3430,7 @@ dependencies = [
 [[package]]
 name = "ng-rocksdb"
 version = "0.21.0"
-source = "git+https://git.nextgraph.org/NextGraph/rust-rocksdb.git?branch=master#9fedf34e567e00c5f1a0d7dea4e613a445148e76"
+source = "git+https://git.nextgraph.org/NextGraph/rust-rocksdb.git?branch=master#866eb4de14fce1b699de7549875125e36a33cf95"
 dependencies = [
  "bindgen",
  "bzip2-sys",

ng-app/src-tauri/src/lib.rs

@@ -220,10 +220,10 @@ async fn open_window(
     app: tauri::AppHandle,
 ) -> Result<(), ()> {
     log_debug!("open window url {:?}", url);
-    let already_exists = app.get_window(&label);
+    let _already_exists = app.get_window(&label);
     #[cfg(desktop)]
-    if already_exists.is_some() {
+    if _already_exists.is_some() {
-        let _ = already_exists.unwrap().close();
+        let _ = _already_exists.unwrap().close();
         std::thread::sleep(std::time::Duration::from_secs(1));
     }
     let mut config = WindowConfig::default();