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As of today 'random' command return 1 (CMD_RET_FAILURE) in case of successful execution and 0 (CMD_RET_SUCCESS) in case of bad arguments. Fix that. NOTE: we remove printing usage information from command body so it won't print twice. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Reviewed-by: Simon Glass <sjg@chromium.org>