nand-image-builder: Fix --help/-h option
--help/-h is not working correctly (it's printing the help context on stderr instead of stdout). Adding a valid shortcut for --help solves the problem. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Acked-by: Bernhard Nortmann <bernhard.nortmann@web.de>
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