cleanup, move link_interface_to_vlans to interfaces_assign.php and remove unused code

src/etc/inc/interfaces.inc

@@ -4040,31 +4040,6 @@ function link_interface_to_track6($int, $action = '')
     }
 }
 
-function link_interface_to_vlans($int, $action = '')
-{
-    global $config;
-
-    if (empty($int)) {
-        return;
-    }
-
-    if (isset($config['vlans']['vlan'])) {
-        $ifaces = array();
-        foreach ($config['vlans']['vlan'] as $vlan) {
-            if ($int == $vlan['if']) {
-                if ($action == "update") {
-                    interfaces_bring_up($int);
-                } elseif ($action == "") {
-                    $ifaces[$vlan['tag']] = $vlan;
-                }
-            }
-        }
-        if (!empty($ifaces)) {
-            return $ifaces;
-        }
-    }
-}
-
 function link_interface_to_vips($int, $action = '')
 {
     global $config;

src/www/interfaces_assign.php

@@ -35,6 +35,20 @@ require_once("system.inc");
 require_once("interfaces.inc");
 require_once("services.inc");
 
+function link_interface_to_vlans($int)
+{
+    global $config;
+
+    if (isset($config['vlans']['vlan'])) {
+        foreach ($config['vlans']['vlan'] as $vlan) {
+            if ($int == $vlan['if']) {
+                interfaces_bring_up($int);
+            }
+        }
+    }
+}
+
+
 function list_interfaces() {
     global $config;
     $interfaces  = array();
@@ -202,7 +216,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             if(!empty($config['interfaces']['lan']) && !empty($config['dhcpd']['wan']) && !empty($config['dhcpd']['wan']) ) {
                 unset($config['dhcpd']['wan']);
             }
-            link_interface_to_vlans($realid, "update");
+            link_interface_to_vlans($realid);
             header(url_safe('Location: /interfaces_assign.php'));
             exit;
         }