Index: class-http.php
===================================================================
--- class-http.php	(revision 13399)
+++ class-http.php	(working copy)
@@ -551,7 +551,7 @@
 	 */
 	function block_request($uri) {
 		// We don't need to block requests, because nothing is blocked.
-		if ( ! defined('WP_HTTP_BLOCK_EXTERNAL') || ( defined('WP_HTTP_BLOCK_EXTERNAL') && WP_HTTP_BLOCK_EXTERNAL == false ) )
+		if ( ! ( defined('WP_HTTP_BLOCK_EXTERNAL') && WP_HTTP_BLOCK_EXTERNAL ) )
 			return false;
 
 		// parse_url() only handles http, https type URLs, and will emit E_WARNING on failure.