python-libfdisk raises Python exceptions when the libfdisk reports an
error when executing some function. libfdisk returns negative
errno values when reporting some error.
Adds utility function to set PyErr string based on the strerror of
a given errno code. Useful when raising Python exceptions.
Call Partition_AddModuleObject when initializing the python module.
Fixes bug when using the Partition class but the class has not
been added to the module via Py_TypeReady.
A common error was the type not being ready (missing attributes):
>>> for pa in cxt.parts:
... print(pa.partno)
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
AttributeError: 'libfdisk.Partition' object has no attribute 'partno'