XCB: Handle new enum value in switch

The new enum value was introduced in f3612f39



Change-Id: I9ab5d8fba459408246e9a6f40c5c086af5abbf82
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>