Drupal 6 code needing conversion to Drupal 7

gistfile1.txt

<?php
if (arg(0) == 'node' && is_numeric(arg(1)) && is_null(arg(2))) {
  $node = node_load(arg(1));
  if ($node->field_related_msds[0]['nid']) {
    foreach ($node->field_related_msds as $msds_node_reference) {
       $msds_node = node_load($msds_node_reference['nid']);
       echo theme('filefield_file', $msds_node->field_msds[0]);
    }
  } else {
    echo "none posted for this product.";
  }
}
?>

Found this to work in Drupal 7:
<?php
if (arg(0) == 'node' && is_numeric(arg(1)) && is_null(arg(2))) {
  $node = node_load(arg(1));
  if (count($node->field_related_msds)) {
    foreach ($node->field_related_msds['und'] as $msds_node_reference) {
      $msds_node = node_load($msds_node_reference['nid']);
      $the_field = field_view_field('node', $msds_node, 'field_msds', array('label' => 'hidden'));
      echo render($the_field);
    }
  } else {
    echo "none posted for this product.";
  }
}
?>