Increase length of IP field to account for IPv6

Author: dd32

src/wp-admin/includes/schema.php

@@ -274,7 +274,7 @@ function wp_get_db_schema( $scope = 'all', $blog_id = null ) {
 CREATE TABLE $wpdb->registration_log (
 	ID bigint(20) unsigned NOT NULL auto_increment,
 	email varchar(255) NOT NULL default '',
-	IP varchar(30) NOT NULL default '',
+	IP varchar(39) NOT NULL default '',
 	blog_id bigint(20) unsigned NOT NULL default '0',
 	date_registered datetime NOT NULL default '0000-00-00 00:00:00',
 	PRIMARY KEY  (ID),