mtd: nand: omap: fix error-codes returned from omap-elm driver
This patch omap-elm.c: replaces -ve integer value returned during errorneous condition, with proper error-codes. omap-gpmc.c: updates omap-gpmc driver to pass error-codes returned from omap-elm driver to upper layers Signed-off-by: NPekon Gupta <pekon@ti.com> Reviewed-by: NStefan Roese <sr@denx.de>
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