In `wp-admin/plugin-editor.php`, `break` is unreachabled after `exit`.

See #27882.


git-svn-id: https://develop.svn.wordpress.org/trunk@28310 602fd350-edb4-49c9-b593-d223f7449a82
In `wp-admin/plugins.php`, `break` is unreachabled after `exit`.

See #27882.


git-svn-id: https://develop.svn.wordpress.org/trunk@28311 602fd350-edb4-49c9-b593-d223f7449a82
In `wp-admin/post.php`, `break` is unreachabled after `exit`.

See #27882.


git-svn-id: https://develop.svn.wordpress.org/trunk@28312 602fd350-edb4-49c9-b593-d223f7449a82
In `wp-admin/theme-editor.php`, `break` is unreachabled after `exit`.

See #27882.


git-svn-id: https://develop.svn.wordpress.org/trunk@28313 602fd350-edb4-49c9-b593-d223f7449a82
In `core_upgrade_preamble()`, `$alternate` is set then never used.

See #27882.


git-svn-id: https://develop.svn.wordpress.org/trunk@28314 602fd350-edb4-49c9-b593-d223f7449a82
In `wp-admin/users.php`, `break` is unreachabled after `exit`.

See #27882.


git-svn-id: https://develop.svn.wordpress.org/trunk@28315 602fd350-edb4-49c9-b593-d223f7449a82