rc: if we replace, replace all #1606

src/etc/rc.initial.setlanip

@@ -219,10 +219,11 @@ function add_gateway_to_config($interface, $gatewayip, $inet_type, $is_in_subnet
     $is_default = true;
     $new_name = '';
 
-    foreach ($a_gateways as $item) {
+    foreach ($a_gateways as &$item) {
         if ($item['ipprotocol'] === $inet_type) {
             if ($item['interface'] === $interface && $item['gateway'] === $gatewayip) {
                 $new_name = $item['name'];
+                unset($item);
                 continue;
             }
             if (isset($item['defaultgw'])) {
@@ -247,6 +248,8 @@ function add_gateway_to_config($interface, $gatewayip, $inet_type, $is_in_subnet
 
     if ($new_name == '') {
         $new_name = next_unused_gateway_name($interface);
+    }
+
     $item = array(
         'descr' => sprintf('Interface %s Gateway', strtoupper($interface)),
         'defaultgw' => $is_default,
@@ -261,8 +264,8 @@ function add_gateway_to_config($interface, $gatewayip, $inet_type, $is_in_subnet
     if (!$is_in_subnet) {
         $item['fargw'] = 1;
     }
+
     $a_gateways[] = $item;
-    }
 
     return $new_name;
 }