Shouldn't use PHP_INT_MAX for default max SQL integer

We installed IP address manager on a site a few days ago, and today when I looked at the logs, I'm seeing this every cron run:

PDOException: SQLSTATE[22003]: Numeric value out of range: 7 ERROR: value "9223372036854775807" is out of range for type integer LINE 1: ...t' AND message = '@type: added %title.' AND wid < '922337203... ^: SELECT wid, hostname, link FROM {watchdog} WHERE type = 'content' AND message = :msg AND wid < :backlog_nodes ORDER BY wid DESC LIMIT 20 OFFSET 0; Array ( [:msg] => @type: added %title. [:backlog_nodes] => 9223372036854775807 ) in ip_backlog_nodes() (line 359 of /home/site1/public_html/sites/all/modules/ip/ip.module).

The problem is in this code:

  $ip_backlog_nodes = variable_get('ip_backlog_nodes', PHP_INT_MAX);
  if ($ip_backlog_nodes) {
    $result = db_query_range(
      "SELECT wid, hostname, link" .
      " FROM {watchdog}" .
      " WHERE type = 'content'" .
      " AND message = :msg" .
      " AND wid < :backlog_nodes" .
      " ORDER BY wid DESC",
      0,
      20,
      array(
        ':msg' => '@type: added %title.',
        ':backlog_nodes' => $ip_backlog_nodes,
      )
    );

The issue is the use of PHP_INT_MAX as a default for the ip_backlog_nodes Drupal variable. The value of PHP_INT_MAX changes depending on whether PHP is compiled for 32-bit or a 64-bit machine, while the size of a SQL int field is fixed at 32 bits. When running on 64 bits, PHP_INT_MAX will be too large for the wid field. The max value for a 32-bit integer (2147483647) should be used here.