mtd: nand: bbt: Fix corner case in bad block table handling

In the unlikely event that both blocks 10 and 11 are marked as bad (on a 32 bit machine), then the process of marking block 10 as bad stomps on cached entry for block 11. There are (of course) other examples.

Signed-off-by: Patrick Doyle pdoyle@irobot.com Reviewed-by: Richard Weinberger richard@nod.at Signed-off-by: Yoshio Furuyama ytc-mb-yfuruyama7@kioxia.com [miquel.raynal@bootlin.com: Fixed the title] Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/774a92693f311e7de01e5935e720a179fb1b2468.1616635406.git.ytc-mb-yfuruyama7@kioxia.com