Commit 
ea533c260a801c4e51f92f75165cebe6d7b01e35 changed
arg_off_size to take a pointer to a device index, rather than
to the device itself.  When updating callers, the nand unlock
code was missed.
Signed-off-by: Scott Wood <scottwood@freescale.com>
        }
 
        if (strcmp(cmd, "unlock") == 0) {
-               if (arg_off_size(argc - 2, argv + 2, nand, &off, &size) < 0)
+               if (arg_off_size(argc - 2, argv + 2, &dev, &off, &size) < 0)
                        return 1;
 
                if (!nand_unlock(&nand_info[dev], off, size)) {