[MTD] [NAND] Wrong calculation of page number in nand_block_bad()

In case that there is no memory based bad block table available the
function nand_block_checkbad() in drivers/mtd/nand/nand_base.c will call
nand_block_bad() directly. When parameter 'getchip' is set to zero,
nand_block_bad() will not right shift the offset to calculate the
correct page number.
Signed-off-by: Thomas Knobloch <knobloch@siemens.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

drivers/mtd/nand/nand_base.c

@@ -312,7 +312,7 @@ static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
 		/* Select the NAND device */
 		chip->select_chip(mtd, chipnr);
 	} else
-		page = (int)ofs;
+		page = (int)(ofs >> chip->page_shift);
 
 	if (chip->options & NAND_BUSWIDTH_16) {
 		chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos & 0xFE,