mtd: rawnand: brcmnand: 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>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: Kamal Dasu <kdasu.kdev@gmail.com>
Link: https://lore.kernel.org/linux-mtd/20200519130035.1883-5-miquel.raynal@bootlin.com

drivers/mtd/nand/raw/brcmnand/brcmnand.c

@@ -3048,9 +3048,15 @@ int brcmnand_remove(struct platform_device *pdev)
 {
 	struct brcmnand_controller *ctrl = dev_get_drvdata(&pdev->dev);
 	struct brcmnand_host *host;
+	struct nand_chip *chip;
+	int ret;
 
-	list_for_each_entry(host, &ctrl->host_list, node)
-		nand_release(&host->chip);
+	list_for_each_entry(host, &ctrl->host_list, node) {
+		chip = &host->chip;
+		ret = mtd_device_unregister(nand_to_mtd(chip));
+		WARN_ON(ret);
+		nand_cleanup(chip);
+	}
 
 	clk_disable_unprepare(ctrl->clk);