Oops! Fix the diff view I broke in r2784.

* lib/viewvc.py
  (view_diff): Add 'cfg' convenience variable (to avoid a stack trace
    caused by using such a thing a few lines later).


git-svn-id: http://viewvc.tigris.org/svn/viewvc/trunk@2790 8cb11bc2-c004-0410-86c3-e597b4017df7

lib/viewvc.py

@@ -3677,6 +3677,7 @@ def view_diff(request):
     raise debug.ViewVCException('Diff generation is disabled',
                                  '403 Forbidden')
 
+  cfg = request.cfg
   p1, p2, rev1, rev2, sym1, sym2 = setup_diff(request)
   
   mime_type1, encoding1 = calculate_mime_type(request, p1, rev1)