fix a SIGTERM handling issue

Signed-off-by: eternal-flame-AD <yume@yumechi.jp>

src/main.rs

@@ -38,7 +38,6 @@ fn interrupt() -> mpsc::Receiver<()> {
                 tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate())
                     .expect("Failed to listen for SIGTERM");
             while sigterm.recv().await.is_some() {
-                sigterm.recv().await;
                 tx_clone.send(()).await.expect("Failed to send interrupt");
             }
         });