Fix segfault when connecting with wrong credentials.

CHANGELOG.md

@@ -7,6 +7,7 @@
 - Add warning that there is no Ox support for messages of type headline.
 - Suppress warnings about reading from closed connection if go-sendxmpp closes the connection before exiting.
 - Remove unnecessary newlines after stanzas.
+- Fix segfault when authentication fails due to invalid username or password.
 
 ## [v0.6.1] 2023-07-25
 ### Changed

connect.go

@@ -5,7 +5,6 @@
 package main
 
 import (
-	"errors"
 	"fmt"
 	"net"
 	"strings"
@@ -34,7 +33,7 @@ func connect(options xmpp.Options, directTLS bool) (*xmpp.Client, error) {
 				options.Host = net.JoinHostPort(adr.Target, fmt.Sprint(adr.Port))
 				// Connect to server
 				client, err := options.NewClient()
-				if errors.Unwrap(err) == nil {
+				if err == nil {
 					return client, nil
 				}
 			}
@@ -53,7 +52,7 @@ func connect(options xmpp.Options, directTLS bool) (*xmpp.Client, error) {
 	}
 	// Connect to server
 	client, err := options.NewClient()
-	if errors.Unwrap(err) == nil {
+	if err == nil {
 		return client, nil
 	}
 	return client, fmt.Errorf("failed to connect to server: %w", err)