nand_base: trivial: fix comment read/write comment

Replace an incorrect 'read' with 'write' in a comment.

Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
Acked-by: Detlev Zundel <dzu@denx.de>
Signed-off-by: Scott Wood <scottwood@freescale.com>
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 52f8575..1a95a91 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1950,7 +1950,7 @@
 	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)