GCC4.6: Squash warning in nand_bbt.c

nand_bbt.c: In function ‘search_bbt’:
nand_bbt.c:465:6: warning: variable ‘bits’ set but not used
[-Wunused-but-set-variable]

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Scott Wood <scottwood@freescale.com>
diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index 521ddde..ded652b 100644
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -462,7 +462,7 @@
 {
 	struct nand_chip *this = mtd->priv;
 	int i, chips;
-	int bits, startblock, block, dir;
+	int startblock, block, dir;
 	int scanlen = mtd->writesize + mtd->oobsize;
 	int bbtblocks;
 	int blocktopage = this->bbt_erase_shift - this->page_shift;
@@ -486,9 +486,6 @@
 		bbtblocks = mtd->size >> this->bbt_erase_shift;
 	}
 
-	/* Number of bits for each erase block in the bbt */
-	bits = td->options & NAND_BBT_NRBITS_MSK;
-
 	for (i = 0; i < chips; i++) {
 		/* Reset version information */
 		td->version[i] = 0;