The "lctl lfsck_start --device DDDD" option parsing is inconsistent with other lctl commands. It would be more consistent to allow the device to be specified as an lctl option like "lctl --device DDDD lfsck_start" or in interactive mode using the "device" command.

These set the "lcfg_devname" and "cur_device" global variables for lctl and can be used by all of the sub-commands.