cmd: misc: Fix return value for the sleep command
If sleeping has been interrupted, return CMD_RET_FAILURE instead of -1 (CMD_RET_USAGE). Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NJaehoon Chung <jh80.chung@samsung.com>
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