mtd: rawnand: mtk: Fix init error path

Reviewing a series converting the for_each_chil_of_node() loops into
their _scoped variants made me realize there was no cleanup of the
already registered NAND devices upon error which may leak memory on
systems with more than a chip when this error occurs. We should call the
_nand_chips_cleanup() function when this happens.

Fixes: 1d6b1e46 ("mtd: mediatek: driver for MTK Smart Device")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Matthias Brugger <matthias.bgg@kernel.org>
Link: https://lore.kernel.org/linux-mtd/20240826153019.67106-2-miquel.raynal@bootlin.com

drivers/mtd/nand/raw/mtk_nand.c

@@ -1453,8 +1453,10 @@ static int mtk_nfc_nand_chips_init(struct device *dev, struct mtk_nfc *nfc)
 
 	for_each_child_of_node_scoped(np, nand_np) {
 		ret = mtk_nfc_nand_chip_init(dev, nfc, nand_np);
-		if (ret)
+		if (ret) {
+			mtk_nfc_nand_chips_cleanup(nfc);
 			return ret;
+		}
 	}
 
 	return 0;