NetworkPkg/HttpBootDxe: Update device path node to include DNS information

Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>

NetworkPkg/HttpBootDxe/HttpBootImpl.c

@@ -465,6 +465,11 @@ HttpBootStop (
     }
   }
 
+  if (Private->DnsServerIp != NULL) {
+    FreePool (Private->DnsServerIp);
+    Private->DnsServerIp = NULL;
+  }
+
   if (Private->FilePathUri!= NULL) {
     FreePool (Private->FilePathUri);
     HttpUrlFreeParser (Private->FilePathUriParser);