[uploader] Excessive file name change on file upload

Imported from: http://groups.google.com/group/in-portal-bugs/browse_thread/thread/4e2ec9777ddea758#

When uploaded file name ends with "_{some number}", i.e. image_2.jpg, uploader excessively changes its name, by incrementing number in filename, even there is no same file name in the upload folder.

It is fixable by attached patch.

excessive_file_name_change_fix.patch

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