Only create the result logger once

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk/utils@46023 20353a03-c40f-0410-a6d1-a30d3c3de9de

erp5/util/benchmark/result.py

@@ -102,7 +102,8 @@ class BenchmarkResult(object):
   def getLogger(self):
     if not self._logger:
       logging.basicConfig(stream=self.log_file, level=self._log_level)
-      return logging.getLogger('erp5.utils.benchmark')
+      self._logger = logging.getLogger('erp5.utils.benchmark')
+      return self._logger
 
     return self._logger