[issue1564547] Py_signal_pipe

[Gustavo J. A. M. Carneiro]

Gustavo J. A. M. Carneiro added the comment:

> The minimal patch doesn't initialize dummy_char or dummy_c.  It's
harmless here, but please fix it. ;)

The variable is called 'dummy' for a reason.  The value written or read
is irrevelant...

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