Minor fixes (#6533)

* Minor fixes

* Fix compile errors

polkadot/node/subsystem-util/src/nesting_sender.rs

@@ -196,10 +196,10 @@ where
 
 // Helper traits and implementations:
 
-impl<M, M1> Clone for NestingSender<M, M1>
+impl<M, Mnested> Clone for NestingSender<M, Mnested>
 where
 	M: 'static,
-	M1: 'static,
+	Mnested: 'static,
 {
 	fn clone(&self) -> Self {
 		Self { sender: self.sender.clone(), conversion: self.conversion.clone() }