fix(og): remove unused helper; build

internal/httpapi/server.go

@@ -230,7 +230,6 @@ func (s *Server) handleLinkCard(w http.ResponseWriter, r *http.Request) {
     if err != nil { w.WriteHeader(http.StatusBadGateway); _, _ = w.Write([]byte("parse error")); return }
     var title, desc, img string
     var walker func(*xhtml.Node)
-    getAttr := func(n *xhtml.Node, key string) string { for a := n.Attr; a != nil && len(n.Attr) > 0; a = nil { for _, at := range n.Attr { if strings.EqualFold(at.Key, key) { return at.Val } } ; return "" } }
     walker = func(n *xhtml.Node) {
         if n.Type == xhtml.ElementNode && strings.EqualFold(n.Data, "meta") {
             // property or name + content