gh-104190: fix ubsan crash by sunmy2019 · Pull Request #104191 · python/cpython

Maybe we should consider renaming the variable.

It makes sense in some respects. But a quick search in the code base, most variable names receiving PyType_FromModuleAndSpec has patterns

xxx_xxx_type (count=30)
XxxXxx_Type (count=15)
XxxXxxType (count=6)

No strong preference was found. I am OK either way.