bad validation of require fields

Users can submit location form even if the require fields (which has been set as 'require' by admin) are empty.
The bug takes place in the 'location_nodeapi' function, case 'validate', where $field_names array is not parsed correctly.

see the patch attached (works on CVS location.module 1.43 and 1.42 (for drupal 4.6 users))

Damien