cmd: change the return value when argc error

When the number of parameters is wrong, the return value should be processed in
the same way as other cmds, return CMD_RET_USAGE so that it can print the information.

Signed-off-by: Shenlin Liang <liangshenlin@eswincomputing.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed