Of course, sourceforge ate the spaces again... sorry.
Here is the patch again:

Index: Objects/unicodeobject.c
===================================================================
--- Objects/unicodeobject.c     (revision 56284)
+++ Objects/unicodeobject.c     (working copy)
@@ -1207,7 +1207,6 @@
                                    PyBytes_Size(b));
     Py_DECREF(b);
     if (!errors) {
-        Py_XINCREF(v);
         ((PyUnicodeObject *)unicode)->defenc = v;
     }
     return v;