fix: Check if already committed in commit (#568)

Co-authored-by: sinu.eth <65924192+sinui0@users.noreply.github.com>

crates/tls/mpc/src/leader.rs

@@ -332,6 +332,9 @@ impl MpcTlsLeader {
 
     #[instrument(level = "debug", skip_all, err)]
     async fn commit(&mut self) -> Result<(), MpcTlsError> {
+        if self.committed {
+            return Ok(());
+        }
         self.state.try_as_active()?;
 
         debug!("committing to transcript");