Forgot to handle Banned in inject_connected (#2107)

* Forgot to handle Banned in inject_connected

* Also add debug for the state

substrate/core/network-libp2p/src/custom_proto/behaviour.rs

@@ -571,7 +571,8 @@ where
 		match (self.peers.entry(peer_id), connected_point) {
 			(Entry::Occupied(mut entry), connected_point) => {
 				match mem::replace(entry.get_mut(), PeerState::Poisoned) {
-					PeerState::Requested | PeerState::PendingRequest { .. } => {
+					PeerState::Requested | PeerState::PendingRequest { .. } |
+					PeerState::Banned { .. } => {
 						debug!(target: "sub-libp2p", "Libp2p => Connected({:?}): Connection \
 							requested by PSM (through {:?})", entry.key(), connected_point);
 						debug!(target: "sub-libp2p", "Handler({:?}) <= Enable", entry.key());
@@ -584,7 +585,7 @@ where
 					st @ _ => {
 						// This is a serious bug either in this state machine or in libp2p.
 						error!(target: "sub-libp2p", "Received inject_connected for \
-							already-connected node");
+							already-connected node; state is {:?}", st);
 						*entry.into_mut() = st;
 						return
 					}