[PATCH][MTD]Remove dead code

[Bruce_Leonard at selinc.com]

As near as I can tell this line of code serves no usefull purpose, so I 
removed it.

Signed-off-by: Bruce Leonard <brucle at selinc.com>

---

diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index 5e121ce..2733e04 100644
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -1029,7 +1029,6 @@ int nand_update_bbt(struct mtd_info *mtd, loff_t 
offs)
        if (!this->bbt || !td)
                return -EINVAL;
 
-       len = mtd->size >> (this->bbt_erase_shift + 2);
        /* Allocate a temporary buffer for one eraseblock incl. oob */
        len = (1 << this->bbt_erase_shift);
        len += (len >> this->page_shift) * mtd->oobsize;