See C99 6.5.6 §7: For the purposes of these operators, a pointer to an object that is not an element of an array behaves the same as a pointer to the first ele

See C99 6.5.6 §7: For the purposes of these operators, a pointer to an object that is not an element of an array behaves the same as a pointer to the first element of an array of length one with the type of the object as its element type.