Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 22080)
+++ wp-includes/functions.php	(working copy)
@@ -1391,7 +1391,7 @@
 
 	if ( function_exists('sys_get_temp_dir') ) {
 		$temp = sys_get_temp_dir();
-		if ( is_dir( $temp ) && ( $is_win ? win_is_writable( $temp ) : @is_writable( $temp ) ) ) {
+		if ( @is_dir( $temp ) && ( $is_win ? win_is_writable( $temp ) : @is_writable( $temp ) ) ) {
 			return trailingslashit( $temp );
 		}
 	}
@@ -3758,4 +3758,4 @@
  */
 function wp_checkdate( $month, $day, $year, $source_date ) {
 	return apply_filters( 'wp_checkdate', checkdate( $month, $day, $year ), $source_date );
-}
\ No newline at end of file
+}