The handler do_setdsr receives only the dsr parameter,
the action is parsed before.
Error was introduced when restructuring the mmc command
implementation in commit 
1fd93c6e7d8a1e4d6261058cefab11b875ded252.
Reported-by: Michael Krummsdorf <Michael.Krummsdorf@tq-group.com>
Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
 
        if (argc != 2)
                return CMD_RET_USAGE;
-       val = simple_strtoul(argv[2], NULL, 16);
+       val = simple_strtoul(argv[1], NULL, 16);
 
        mmc = find_mmc_device(curr_device);
        if (!mmc) {