> I don't think this is true for C. The NULL macro is defined to be a pointer in the C standard, AFAIK. Just because comparisons with zero are allowed, does not imply that the standard implicitly promotes NULL to `int`.

Probably confusion with C++ where NULL is 0 which is a special case that can be implicitly cast to both integers and pointers, unlike non-zero constants. C doesn't need this because it doesn't require explicit casts from void pointers to others.