Uploads: Fix the Order of Operations for wp_mkdir_p() which caused this branch...

Uploads: Fix the Order of Operations for wp_mkdir_p() which caused this branch to never be hit. Props fboender. Fixes #26781 for trunk. See #25822

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git-svn-id: https://core.svn.wordpress.org/trunk@26807 1a063a9b-81f0-0310-95a4-ce76da25c4cd