Wordfence Alert email

we just installed the free verion of Wordfence to a site still in development mode (not live yet). We received an email alert:
* WordPress core file modified: wp-admin/includes/upgrade.php
* WordPress core file modified: wp-includes/functions.php
* The Plugin “Akismet” needs an upgrade.

the Askimet plugin is not active, so I’m disreagarding that alert.

The file difference in Functions.php was only in line 2554:
original die(); modified: exit(1);

is this a hack? not sure if I should change this?

the other change was in wp-admin/includes/upgrade.php
starting in line 2122

original code:
if ( is_wp_error( $result ) ) {
die( $result->get_error_message() );
}
modified version:
if ( is_wp_error( $result ) ) {
echo $result->get_error_message();
exit(1);

}