Revert "Whilst fixing issues with SSDP on devices with multiple interfaces, i came across a design issue in the current code - namely interfaces without a gateway were ignored."

This reverts commit 2aaecb8e14.

RSSDP/SsdpDeviceLocator.cs

@@ -357,7 +357,7 @@ namespace Rssdp.Infrastructure
         private void ProcessSearchResponseMessage(HttpResponseMessage message, IPAddress localIpAddress)
         {
             if (!message.IsSuccessStatusCode) return;
-            
+
             var location = GetFirstHeaderUriValue("Location", message);
             if (location != null)
             {