[File] [PATCH] python/magic.py: avoid TypeError in del at interpreter shutdown

[Vincent Mihalkovic]

Hi,

I am seeing a TypeError at Python interpreter shutdown when using the
Python bindings shipped with file (python/magic.py).

MagicDetect.__del__() calls Magic.close() (see
https://github.com/file/file/blob/master/python/magic.py#L300-L310), which
in turn calls the module-global _close in Magic.close() (see
https://github.com/file/file/blob/master/python/magic.py#L130-L136).

During interpreter shutdown, module globals may already be cleared, so
_close can become None, resulting in: TypeError: ‘NoneType’ object is not
callable

The attached patch avoids relying on the module-global _close during
finalization by caching the magic_close function pointer on the Magic instance
and using that in close(). This prevents the shutdown exception without
changing normal runtime behavior.

Related downstream report:
https://bugzilla.redhat.com/show_bug.cgi?id=2419719

Best regards,
Vincent
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