mtd: nand: make use of mtd_to_nand() in NAND drivers

mtd_to_nand() was recently introduced to avoid direct accesses to the
mtd->priv field. Update all NAND drivers to use it.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/drivers/mtd/nand/pasemi_nand.c b/drivers/mtd/nand/pasemi_nand.c
index 83cf021..0ececac 100644
--- a/drivers/mtd/nand/pasemi_nand.c
+++ b/drivers/mtd/nand/pasemi_nand.c
@@ -45,7 +45,7 @@
 
 static void pasemi_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 {
-	struct nand_chip *chip = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
 
 	while (len > 0x800) {
 		memcpy_fromio(buf, chip->IO_ADDR_R, 0x800);
@@ -57,7 +57,7 @@
 
 static void pasemi_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 {
-	struct nand_chip *chip = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
 
 	while (len > 0x800) {
 		memcpy_toio(chip->IO_ADDR_R, buf, 0x800);
@@ -70,7 +70,7 @@
 static void pasemi_hwcontrol(struct mtd_info *mtd, int cmd,
 			     unsigned int ctrl)
 {
-	struct nand_chip *chip = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
 
 	if (cmd == NAND_CMD_NONE)
 		return;
@@ -192,7 +192,7 @@
 	if (!pasemi_nand_mtd)
 		return 0;
 
-	chip = pasemi_nand_mtd->priv;
+	chip = mtd_to_nand(pasemi_nand_mtd);
 
 	/* Release resources, unregister device */
 	nand_release(pasemi_nand_mtd);