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With modern systems using bus-hold instead of bus pull-up, it can often lead to erroneous reporting of NAND devices where there are none. Do a double probe to ensure that the result we got the first time is repeatable, and if it is not then return that there is no chip there. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>