Update listener.go

Author: poopoothegorilla

chains/heads/listener.go

@@ -133,14 +133,14 @@ func (l *listener[HTH, S, ID, BLOCK_HASH]) Connected() bool {
 }
 
 func (l *listener[HTH, S, ID, BLOCK_HASH]) HealthReport() map[string]error {
-	var errs []error
+	var err error
 	if !l.ReceivingHeads() {
-		errs = append(errs, errors.New("Listener is not receiving heads"))
+		err = errors.Join(err, errors.New("Listener is not receiving heads"))
 	}
 	if !l.Connected() {
-		errs = append(errs, errors.New("Listener is not connected"))
+		err = errors.Join(err, errors.New("Listener is not connected"))
 	}
-	return map[string]error{l.Name(): errors.Join(errs...)}
+	return map[string]error{l.Name(): err}
 }
 
 func (l *listener[HTH, S, ID, BLOCK_HASH]) receiveHeaders(ctx context.Context, handleNewHead Handler[HTH, BLOCK_HASH]) error {