In `wp-includes/class-wp-customize-setting.php`, `break` is unreachable after `return`.

See #27882.


git-svn-id: https://develop.svn.wordpress.org/trunk@28319 602fd350-edb4-49c9-b593-d223f7449a82
In `WP_Image_Editor::get_output_format()`, `$file_mime` and `$file_ext` are set twice before they are used.

See #27882.


git-svn-id: https://develop.svn.wordpress.org/trunk@28320 602fd350-edb4-49c9-b593-d223f7449a82