Fix leaving MUCs before closing the connection.

go-sendxmpp.go

@@ -415,7 +415,7 @@ func main() {
 		}
 		// After sending the message, leave the MUCs
 		for _, recipient := range recipients {
-			_, err = client.LeaveMUC(recipients[0])
+			_, err = client.LeaveMUC(recipient)
 			if err != nil {
 				log.Println(err)
 			}