Always exit after wp_redirect. props filosofo, fixes #15518.

git-svn-id: http://svn.automattic.com/wordpress/trunk@16847 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/network/site-options.php

@@ -48,6 +48,7 @@ if ( isset($_REQUEST['action']) && 'update-site' == $_REQUEST['action'] && is_ar
 	do_action( 'wpmu_update_blog_options' );
 	restore_current_blog();
 	wp_redirect( add_query_arg( array( 'update' => 'updated', 'id' => $id ), 'site-options.php') );
+	exit;
 }
 
 if ( isset($_GET['update']) ) {
@@ -131,4 +132,4 @@ if ( ! empty( $messages ) ) {
 
 </div>
 <?php
-require('../admin-footer.php');
+require('../admin-footer.php');