examples/chat: Various fixes

examples/chat/server/main.go

@@ -1,6 +1,7 @@
 package main
 
 import "os"
+import "io"
 import "fmt"
 import "log"
 import "errors"
@@ -48,7 +49,7 @@ func host(address string, certPath, keyPath string) error {
 
 type client struct {
 	conn     hopp.Conn
-	nickname hopp.Option[string]
+	nickname string
 	rooms    usync.RWMonitor[map[string] hopp.Trans]
 }
 
@@ -58,13 +59,13 @@ func (this *client) run() {
 	defer this.conn.Close()
 
 	for {
-		log.Println("accepting transaction")
 		trans, err := this.conn.AcceptTrans()
 		if err != nil {
-			log.Printf("XXX %v failed: %v", this.conn.RemoteAddr(), err)
+			if !errors.Is(err, io.EOF) {
+				log.Printf("XXX %v failed: %v", this.conn.RemoteAddr(), err)
+			}
 			return
 		}
-		log.Println("accepted transaction")
 		go this.runTrans(trans)
 	}
 }
@@ -111,7 +112,7 @@ func (this *client) transTalk(trans hopp.Trans, initial *chat.MessageJoin) error
 }
 
 func (this *client) handleMessageChat(trans hopp.Trans, room string, message *chat.MessageChat) error {
-	log.Println("(). %s #%s: %s", this.nickname, room, message.Content)
+	log.Printf("(). %s #%s: %s", this.nickname, room, message.Content)
 	clients, done := clients.RBorrow()
 	defer done()
 	for client := range clients {