transaction: nullify journal after close()

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transaction: nullify journal after close()

This keeps us from trying to cleanup in __del__.

bug spotted by K Thananchayan <[e-mail]>

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mercurial/transaction.py

@@ -52,6 +52,7 b' class transaction:'
             util.rename(self.journal, self.after)
         else:
             os.unlink(self.journal)
+        self.journal = None
 
     def abort(self):
         if not self.entries: return