Give onReceive lambda an explicit name for it to avoid conflicts

server/src/main/kotlin/org/muellerssoftware/openproximitychat/tracker/HolePunchApplication.kt

@@ -21,9 +21,9 @@ fun Application.puncher() {
         Logging.info("HolePunch listening on ${serverSocket.localAddress}")
 
         select<Unit> {
-            serverSocket.incoming.onReceive {
-                val address = it.address
-                val packet = it.packet
+            serverSocket.incoming.onReceive { datagram ->
+                val address = datagram.address
+                val packet = datagram.packet
                 val packetBytes = packet.readByteBuffer()
 
                 val uuid: UUID?