Fix a couple of clippy warnings

examples/async-std-echo.rs

@@ -16,10 +16,7 @@ async fn run() -> Result<(), Box<dyn std::error::Error>> {
     println!("Sending: \"{}\"", text);
     ws_stream.send(Message::text(text)).await?;
 
-    let msg = ws_stream
+    let msg = ws_stream.next().await.ok_or("didn't receive anything")??;
-        .next()
-        .await
-        .ok_or_else(|| "didn't receive anything")??;
 
     println!("Received: {:?}", msg);
 

examples/gio-echo.rs

@@ -11,10 +11,7 @@ async fn run() -> Result<(), Box<dyn std::error::Error>> {
     println!("Sending: \"{}\"", text);
     ws_stream.send(Message::text(text)).await?;
 
-    let msg = ws_stream
+    let msg = ws_stream.next().await.ok_or("didn't receive anything")??;
-        .next()
-        .await
-        .ok_or_else(|| "didn't receive anything")??;
 
     println!("Received: {:?}", msg);
 

examples/tokio-echo.rs

@@ -22,10 +22,7 @@ async fn run() -> Result<(), Box<dyn std::error::Error>> {
     println!("Sending: \"{}\"", text);
     ws_stream.send(Message::text(text)).await?;
 
-    let msg = ws_stream
+    let msg = ws_stream.next().await.ok_or("didn't receive anything")??;
-        .next()
-        .await
-        .ok_or_else(|| "didn't receive anything")??;
 
     println!("Received: {:?}", msg);
 

src/lib.rs

@@ -394,5 +394,7 @@ pub(crate) fn port(
             Some("ws") => Some(80),
             _ => None,
         })
-        .ok_or_else(|| tungstenite::Error::Url(tungstenite::error::UrlError::UnsupportedUrlScheme))
+        .ok_or(tungstenite::Error::Url(
+            tungstenite::error::UrlError::UnsupportedUrlScheme,
+        ))
 }