Issue #2080687 by chertzog: Remove Unused local variable from /core/modules/update/update.module.

core/modules/update/update.module

@@ -672,7 +672,7 @@ function update_verify_update_archive($project, $archive_file, $directory) {
   $compatible_project = FALSE;
   $incompatible = array();
   $files = file_scan_directory("$directory/$project", '/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.info.yml$/', array('key' => 'name', 'min_depth' => 0));
-  foreach ($files as $key => $file) {
+  foreach ($files as $file) {
     // Get the .info.yml file for the module or theme this file belongs to.
     $info = drupal_parse_info_file($file->uri);