SimplePie: Fix use of DOMElement as array.

props MikeSchinkel.
fixes #25274.

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Bump version in trunk.

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Avoid error in ms-files.php after [25317].

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git-svn-id: http://core.svn.wordpress.org/trunk@25306 1a063a9b-81f0-0310-95a4-ce76da25c4cd