mtd: r852: remove casts from void

Remove unnesessary casts from void*.

Signed-off-by: Kulikov Vasiliy <[e-mail]>
Signed-off-by: Artem Bityutskiy <[e-mail]>
Signed-off-by: David Woodhouse <[e-mail]>

drivers/mtd/nand/r852.c

···
 /* returns pointer to our private structure */
 static inline struct r852_device *r852_get_dev(struct mtd_info *mtd)
 {
-	struct nand_chip *chip = (struct nand_chip *)mtd->priv;
-	return (struct r852_device *)chip->priv;
+	struct nand_chip *chip = mtd->priv;
+	return chip->priv;
 }