luci-app-firewall: drop usage of getOffloadSupport()

Rely on the more generic L.hasSystemFeature() from now on.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

applications/luci-app-firewall/htdocs/luci-static/resources/view/firewall/zones.js

@@ -7,12 +7,6 @@
 'require tools.widgets as widgets';
 
 return L.view.extend({
-	callOffloadSupport: rpc.declare({
-		object: 'luci',
-		method: 'offload_support',
-		expect: { offload_support: false }
-	}),
-
 	callConntrackHelpers: rpc.declare({
 		object: 'luci',
 		method: 'conntrack_helpers',
@@ -21,14 +15,12 @@ return L.view.extend({
 
 	load: function() {
 		return Promise.all([
-			this.callOffloadSupport(),
 			this.callConntrackHelpers()
 		]);
 	},
 
 	render: function(data) {
-		var hasOffloading = data[0],
-		    ctHelpers = data[1],
+		var ctHelpers = data[0],
 		    m, s, o, inp, out;
 
 		m = new form.Map('firewall', _('Firewall - Zone Settings'),
@@ -55,7 +47,7 @@ return L.view.extend({
 
 		/* Netfilter flow offload support */
 
-		if (hasOffloading) {
+		if (L.hasSystemFeature('offloading')) {
 			s = m.section(form.TypedSection, 'defaults', _('Routing/NAT Offloading'),
 				_('Experimental feature. Not fully compatible with QoS/SQM.'));