fix clippy if let lint

Author: ckampfe

src/channel.rs

@@ -59,11 +59,10 @@ async fn clean_up_unused_channels(
         let mut channel_clients = state.channel_clients.lock().await;
 
         if let Some(namespace_channels) = channel_clients.get_mut(&namespace) {
-            if let Some((tx, _rx)) = namespace_channels.get(&channel_name) {
-                if tx.sender_count() <= 1 && tx.receiver_count() <= 1 {
+            if let Some((tx, _rx)) = namespace_channels.get(&channel_name)
+                && tx.sender_count() <= 1 && tx.receiver_count() <= 1 {
                     namespace_channels.remove(&channel_name);
                 }
-            }
 
             if namespace_channels.is_empty() {
                 channel_clients.remove(&namespace);