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In nand_wait_ready there is a loop that includes a NULL check for chip->dev_ready before it is dereferenced. Use a NULL check once the loop is exited as well to cover the case where it exits due to a timeout and it is therefore not known if chip->dev_ready is NULL or not. This issue found by Smatch. Signed-off-by: Andrew Goodbody <andrew.goodbody@linaro.org> Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>