`wp_xmlrpc_server::wp_getPage()` should `return new IXR_Error(` instead of `return(new IXR_Error(`. One of the few places that is unparseable by static analysis.

See #27882.

Built from https://develop.svn.wordpress.org/trunk@28636


git-svn-id: http://core.svn.wordpress.org/trunk@28454 1a063a9b-81f0-0310-95a4-ce76da25c4cd