Make sure the first number in LIMIT clause in WP_Query::get_posts() is always an integer.

fixes #23383.
Built from https://develop.svn.wordpress.org/trunk@28864


git-svn-id: http://core.svn.wordpress.org/trunk@28664 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid a PHP notice and warning on language selection screen.

props meekyhwang.
fixes #28648.
Built from https://develop.svn.wordpress.org/trunk@28865


git-svn-id: http://core.svn.wordpress.org/trunk@28665 1a063a9b-81f0-0310-95a4-ce76da25c4cd