cmd: efi_loader: Return CMD_RET_USAGE in case of not enough arguments
When typing 'bootefi' from U-Boot shell, nothing outputs. Like other commands, return CMD_RET_USAGE so that it can print help message. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NAlexander Graf <agraf@suse.de>
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