mtd: Blackfin NFC: fix build error after nand_scan_ident() change

Seems some patches got out sync when being merged.  The Blackfin NFC
driver was updated to use nand_scan_ident(), but it missed the change
where nand_scan_ident() now takes 3 arguments.  So update this driver
to fix build failures.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nand/bf5xx_nand.c

@@ -710,7 +710,7 @@ static int bf5xx_nand_scan(struct mtd_info *mtd)
 	struct nand_chip *chip = mtd->priv;
 	int ret;
 
-	ret = nand_scan_ident(mtd, 1);
+	ret = nand_scan_ident(mtd, 1, NULL);
 	if (ret)
 		return ret;