Return NULL from PyInit_* when exception is raised

I don't think this is documented anywhere, but I'm pretty sure module init
functions should return NULL in order to communicate that an exception
occurred during initialization (as is the standard Python/C API convention).

It's clear from the CPython code
[here](https://github.com/python/cpython/blob/master/Python/importdl.c#L162)
that if you don't return NULL, the exception is swallowed and replaced with the
message "initialization of %s raised unreported exception".

Admittedly, this is only useful for people porting Numpy to new platforms where
it is helpful to know where module initialization is failing, but it can't hurt.

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