gh-132097: fix runtime UB when calling expat handlers #132265
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I've also changed a bit the code style because most of the file is using
TYPE *NAMEinstead ofTYPE* NAMEdeclarations. And also, there were already inconsistencies in the affected functions. I've also changed_XMLParser_CASTintoXMLParserObject_CASTbecause it's easier to remember<NAME>_<CAST>instead of<SOMETHING_ELSE>_<CAST>(anyway it was me who introduced that macro last year but I didn't think of that at that time).Review without whitespace changes: https://github.com/python/cpython/pull/132265/files?diff=split&w=1.
-fsanitize=undefined -fno-sanitize-recover#132097