[issue41056] minor NULL pointer and sign issues reported by Coverity

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

those were the three in the email (20 of 106), i need to figure out how to login to coverity again to see the rest.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41056>
_______________________________________