Fix expiration date logic to use latest entitlement end date

[vijaidjearam]

A device can have multiple entitlements, each with its own endDate.
When determining the expiration date, we need to return the latest (maximum) end date, since that represents the actual final expiration of coverage.

However, using:

$date < $max_date

selects the earliest (minimum) date, which results in:

• Returning the first entitlement that expires
• Incorrectly reporting an earlier expiration date
• Potentially shortening the displayed warranty/coverage period

✅ Correct Logic

To properly determine the expiration date, we must keep the comparison as:

if ($max_date == false || $date > $max_date) {
    $max_date = $date;
}

This ensures that:

• On the first iteration, $max_date is initialized.
• On subsequent iterations, we keep the latest (maximum) endDate.
• The final result reflects the true expiration of all entitlements.