libp2p: Revert discovery address check from stable code

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

substrate/client/network/src/discovery.rs

@@ -749,28 +749,16 @@ impl NetworkBehaviour for DiscoveryBehaviour {
 				self.mdns.on_swarm_event(FromSwarm::NewListenAddr(e));
 			},
 			FromSwarm::ExternalAddrConfirmed(e @ ExternalAddrConfirmed { addr }) => {
-				let mut address = addr.clone();
+				let new_addr = addr.clone().with(Protocol::P2p(self.local_peer_id));
 
-				if let Some(Protocol::P2p(peer_id)) = addr.iter().last() {
-					if peer_id != self.local_peer_id {
-						warn!(
-							target: "sub-libp2p",
-							"🔍 Discovered external address for a peer that is not us: {addr}",
-						);
-						// Ensure this address is not propagated to kademlia.
-						return
-					}
-				} else {
-					address.push(Protocol::P2p(self.local_peer_id));
-				}
-
-				if Self::can_add_to_dht(&address) {
+				if Self::can_add_to_dht(addr) {
 					// NOTE: we might re-discover the same address multiple times
 					// in which case we just want to refrain from logging.
-					if self.known_external_addresses.insert(address.clone()) {
+					if self.known_external_addresses.insert(new_addr.clone()) {
 						info!(
 						  target: "sub-libp2p",
-						  "🔍 Discovered new external address for our node: {address}",
+						  "🔍 Discovered new external address for our node: {}",
+						  new_addr,
 						);
 					}
 				}