mtd: rawnand: lpc32xx_slc: Stop using nand_release()

This helper is not very useful and very often people get confused:
they use nand_release() instead of nand_cleanup().

Let's stop using nand_release() by calling mtd_device_unregister() and
nand_cleanup() directly.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200519130035.1883-25-miquel.raynal@bootlin.com

drivers/mtd/nand/raw/lpc32xx_slc.c

@@ -947,8 +947,12 @@ static int lpc32xx_nand_remove(struct platform_device *pdev)
 {
 	uint32_t tmp;
 	struct lpc32xx_nand_host *host = platform_get_drvdata(pdev);
+	struct nand_chip *chip = &host->nand_chip;
+	int ret;
 
-	nand_release(&host->nand_chip);
+	ret = mtd_device_unregister(nand_to_mtd(chip));
+	WARN_ON(ret);
+	nand_cleanup(chip);
 	dma_release_channel(host->dma_chan);
 
 	/* Force CE high */