btree_gist, gint4_union

In contrib/btree_gist/ I see:

CREATE FUNCTION gint4_union(bytea, internal)
RETURNS int4
AS 'MODULE_PATHNAME'
LANGUAGE 'C';

but gint4_union does this:

INT4KEY *out = palloc(sizeof(INT4KEY));
[...]
PG_RETURN_POINTER(out);

Is the int4 return type declared above a bug?

--
Itai Zukerman <http://www.math-hat.com/~zukerman/>