Remove unecessary reference to wpdb global. Fixes 11087 props aaroncampbell.

git-svn-id: http://svn.automattic.com/wordpress/trunk@12147 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/registration.php

@@ -283,7 +283,6 @@ function wp_update_user($userdata) {
  *
  * @since 2.0.0
  * @see wp_insert_user() More complete way to create a new user
- * @uses $wpdb Escapes $username and $email parameters
  *
  * @param string $username The user's username.
  * @param string $password The user's password.
@@ -291,8 +290,6 @@ function wp_update_user($userdata) {
  * @return int The new user's ID.
  */
 function wp_create_user($username, $password, $email = '') {
-	global $wpdb;
-
 	$user_login = esc_sql( $username );
 	$user_email = esc_sql( $email    );
 	$user_pass = $password;