[issue20631] python readline module crashing on NULL access

[Todd Fiala]

Todd Fiala added the comment:

Cleaned up the proposed patch a bit.  Moves HIST_ENTRY* into a tighter block and removes the second call to history_get() since the value is already stashed in the NULL-checked local.

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Added file: http://bugs.python.org/file34137/python_2.7.6_module_readline_null_02.diff

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