Return from image_downsize() earlier if a custom resize function is used. props anatolbroder. fixes #23392.

git-svn-id: http://core.svn.wordpress.org/trunk@23410 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use correct escaping function. props jkudish. fixes #20771.

git-svn-id: http://core.svn.wordpress.org/trunk@23411 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unused error string. props pavelevap. fixes #22107.

git-svn-id: http://core.svn.wordpress.org/trunk@23412 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use correct escaping function. fixes #23334.

git-svn-id: http://core.svn.wordpress.org/trunk@23413 1a063a9b-81f0-0310-95a4-ce76da25c4cd