tools: fix XML validator detection of network port XML schema

Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

tools/virt-xml-validate.in

@@ -80,6 +80,9 @@ if [ -z "$TYPE" ]; then
      *domain*)
         TYPE="domain"
         ;;
+     *networkport*)
+        TYPE="networkport"
+        ;;
      *network*)
         TYPE="network"
         ;;