Using "0" instead of "NULL" is insane, and leads to unmaintainable code. Fix a number of other "code-hygiene" consistency nits.
Using "0" instead of "NULL" is insane, and leads to unmaintainable code.
Fix a number of other "code-hygiene" consistency nits.

PKRoma/expat,PKRoma/expat,PKRoma/expat,PKRoma/expat