fix webrtc example when webrtc disabled

examples/webrtc.rs

@@ -63,7 +63,7 @@ async fn main() -> Result<()> {
         // Wait for the answer to be pasted
         println!(
             "Start new terminal run: \n{} \ncopy remote endpoint and paste here",
-            format!("cargo r --example webrtc -- --offer {}", local_endpoint)
+            format!("cargo r --features webrtc --example webrtc -- --offer {}", local_endpoint)
         );
         // readline blocking
         let line = std::io::stdin()

src/webrtc.rs

@@ -100,7 +100,7 @@ impl WebRTCStream {
             Self::get_remote_offer(remote_endpoint)?
         };
 
-        let key = remote_offer.clone();
+        let mut key = remote_offer.clone();
         let mut lock = SESSIONS.lock().await;
         if let Some(cached_stream) = lock.get(&key) {
             if !key.is_empty() {