nand_base: trivial: fix comment read/write comment

Replace an incorrect 'read' with 'write' in a comment.
Signed-off-by: NBen Gardiner <bengardiner@nanometrics.ca>
Acked-by: NDetlev Zundel <dzu@denx.de>
Signed-off-by: NScott Wood <scottwood@freescale.com>

drivers/mtd/nand/nand_base.c

@@ -1950,7 +1950,7 @@ static int nand_write(struct mtd_info *mtd, loff_t to, size_t len,
 	struct nand_chip *chip = mtd->priv;
 	int ret;
 
-	/* Do not allow reads past end of device */
+	/* Do not allow writes past end of device */
 	if ((to + len) > mtd->size)
 		return -EINVAL;
 	if (!len)