mtd: nftl: write support is broken

Write support is broken in NFTL. Fix it.

Signed-off-by: <dimitri.gorokhovik@free.fr>
Cc: Tim Gardner <tim.gardner@canonical.com>
Cc: Scott James Remnant <scott@canonical.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nftlcore.c

@@ -181,7 +181,7 @@ static int nftl_write(struct mtd_info *mtd, loff_t offs, size_t len,
 	int res;
 
 	ops.mode = MTD_OOB_PLACE;
-	ops.ooboffs = offs;
+	ops.ooboffs = offs & (mtd->writesize - 1);
 	ops.ooblen = mtd->oobsize;
 	ops.oobbuf = oob;
 	ops.datbuf = buf;