[golangci-lint]: Remove unused client.

stanzahandling.go

@@ -16,7 +16,7 @@ func sendIQ(client *xmpp.Client, iqc chan xmpp.IQ, target string,
 	var iq xmpp.IQ
 	id := getID()
 	c := make(chan xmpp.IQ)
-	go getIQ(client, id, c, iqc)
+	go getIQ(id, c, iqc)
 	_, err := client.RawInformation(client.JID(), target, id,
 		iQtype, content+"\n")
 	if err != nil {
@@ -26,7 +26,7 @@ func sendIQ(client *xmpp.Client, iqc chan xmpp.IQ, target string,
 	return iq, nil
 }
 
-func getIQ(client *xmpp.Client, id string, c chan xmpp.IQ,
+func getIQ(id string, c chan xmpp.IQ,
 	iqc chan xmpp.IQ) {
 	for {
 		iq := <-iqc