mtd: rawnand: oxnas: Release all devices in the _remove() path

oxnans_nand_remove() should release all MTD devices and clean all NAND
devices, not only the first one registered.

Fixes: 66859249 ("mtd: nand: Add OX820 NAND Support")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200519130035.1883-39-miquel.raynal@bootlin.com

drivers/mtd/nand/raw/oxnas_nand.c

@@ -177,9 +177,13 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 static int oxnas_nand_remove(struct platform_device *pdev)
 {
 	struct oxnas_nand_ctrl *oxnas = platform_get_drvdata(pdev);
+	struct nand_chip *chip;
+	int i;
 
-	if (oxnas->chips[0])
-		nand_release(oxnas->chips[0]);
+	for (i = 0; i < oxnas->nchips; i++) {
+		chip = oxnas->chips[i];
+		nand_release(chip);
+	}
 
 	clk_disable_unprepare(oxnas->clk);