lib/connections: Silence vet and lint warnings

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/2971

cmd/stindex/dumpsize.go

@@ -15,7 +15,6 @@ import (
 	"github.com/syndtr/goleveldb/leveldb"
 )
 
-// An IntHeap is a min-heap of ints.
 type SizedElement struct {
 	key  string
 	size int

cmd/syncthing/gui.go

@@ -199,7 +199,10 @@ func (s *apiService) getListener(guiCfg config.GUIConfiguration) (net.Listener,
 		return nil, err
 	}
 
-	listener := &tlsutil.DowngradingListener{rawListener, tlsCfg}
+	listener := &tlsutil.DowngradingListener{
+		Listener:  rawListener,
+		TLSConfig: tlsCfg,
+	}
 	return listener, nil
 }