* HACKING, src/sanity/style.test: NULL is not portable, prohibit it.
* iface/gspn/ssp.cc, src/ltltest/reduc.cc, src/ltltest/syntimpl.cc, src/ltlvisit/basereduc.cc, src/ltlvisit/reducform.cc, src/ltlvisit/syntimpl.cc: Use 0 instead of NULL.
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