xmldiff #5514 fix failing test [rejected]

FAIL: test_profiler (unittest_options.TestProfile)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/auc/rep/public/logilab/common/testlib.py", line 1089, in _proceed
testfunc(*args, **kwargs)
File "unittest_options.py", line 13, in test_profiler
self.assert_( res == 0 )
AssertionError

prioritynormal
typebug
done in<not specified>
load left0.000
closed by<not specified>