Remove mutex as it might block go-sendxmpp forever.

main.go

@@ -17,7 +17,6 @@ import (
 	"os/signal"
 	"runtime"
 	"strings"
-	"sync"
 	"time"
 
 	"github.com/ProtonMail/gopenpgp/v2/crypto" // MIT License
@@ -33,12 +32,8 @@ type configuration struct {
 	alias    string
 }
 
-var mutex sync.Mutex
-
 func closeAndExit(client *xmpp.Client, cancel context.CancelFunc, err error) {
 	cancel()
-	mutex.Lock()
-	defer mutex.Unlock()
 	client.Close()
 	if err != nil {
 		log.Fatal(err)

stanzahandling.go

@@ -52,9 +52,7 @@ func rcvStanzas(client *xmpp.Client, iqc chan xmpp.IQ, msgc chan xmpp.Chat, ctx
 		case <-ctx.Done():
 			return
 		default:
-			mutex.Lock()
 			received, err = client.Recv()
-			mutex.Unlock()
 		}
 		// Don't print errors if the program is getting shut down,
 		// as the errors might be triggered from trying to read from
@@ -64,7 +62,6 @@ func rcvStanzas(client *xmpp.Client, iqc chan xmpp.IQ, msgc chan xmpp.Chat, ctx
 			return
 		default:
 			if err != nil {
-				mutex.Unlock()
 				closeAndExit(client, cancel, err)
 			}
 		}