Mass replace ,); pattern (#3580)

This is an artifact left by rustfmt which is not dare to remove the
comma being conservative.

polkadot/node/core/pvf/src/prepare/pool.rs

@@ -241,7 +241,7 @@ async fn spawn_worker_task(program_path: PathBuf, spawn_timeout: Duration) -> Po
 		match worker::spawn(&program_path, spawn_timeout).await {
 			Ok((idle, handle)) => break PoolEvent::Spawn(idle, handle),
 			Err(err) => {
-				tracing::warn!(target: LOG_TARGET, "failed to spawn a prepare worker: {:?}", err,);
+				tracing::warn!(target: LOG_TARGET, "failed to spawn a prepare worker: {:?}", err);
 
 				// Assume that the failure intermittent and retry after a delay.
 				Delay::new(Duration::from_secs(3)).await;

polkadot/node/core/pvf/src/prepare/worker.rs

@@ -262,7 +262,7 @@ fn renice(pid: u32, niceness: i32) {
 	unsafe {
 		if -1 == libc::setpriority(libc::PRIO_PROCESS, pid, niceness) {
 			let err = std::io::Error::last_os_error();
-			tracing::warn!(target: LOG_TARGET, "failed to set the priority: {:?}", err,);
+			tracing::warn!(target: LOG_TARGET, "failed to set the priority: {:?}", err);
 		}
 	}
 }