[usbstor] Card reader's last device unit is not reported

(From Mattermost chat - tracking activity with @Zombiedeth that has the actual card reader)

The issue seems it misinterprets the Usb_Get_Max_Lun result from the controller - in the case of Zombiedeth's card reader, the controller. returns MAX LUN = 3 (SD, Card Reader, xD-Picture and MS-PRO) - but the controller itself is LUN = 0 so in https://github.com/reactos/reactos/blob/master/drivers/usb/usbstor/fdo.c#L252 the code misses the last one. As a workaround to verify this, I have simply added a +1 and the device appeared with ROS usbstor.
So technically that loop should count +1 or skip the controller as storage