pq_setkeepalives* functions

Hi,

In 2 of 3 pq_setkeepalives* functions we have the #DEFINE involving
even this conditional:
"""
    if (port == NULL || IS_AF_UNIX(port->laddr.addr.ss_family))
        return STATUS_OK;
"""

but in pq_setkeepalivesinterval() the #DEFINE is after the
conditional, doesn't seems to affect anything but for consistency with
the other two :)

--
Atentamente,
Jaime Casanova
Soporte y capacitación de PostgreSQL
Asesoría y desarrollo de sistemas
Guayaquil - Ecuador
Cel. +59387171157