mtd: introduce mtd_write_oob interface

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index fcab50e..20a112f 100644
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -350,7 +350,7 @@
 	ops.oobbuf = oob;
 	ops.len = len;
 
-	return mtd->write_oob(mtd, offs, &ops);
+	return mtd_write_oob(mtd, offs, &ops);
 }
 
 static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td)
diff --git a/drivers/mtd/nand/sm_common.c b/drivers/mtd/nand/sm_common.c
index 32ae5af..774c3c2 100644
--- a/drivers/mtd/nand/sm_common.c
+++ b/drivers/mtd/nand/sm_common.c
@@ -55,7 +55,7 @@
 	ops.datbuf = NULL;
 
 
-	ret = mtd->write_oob(mtd, ofs, &ops);
+	ret = mtd_write_oob(mtd, ofs, &ops);
 	if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) {
 		printk(KERN_NOTICE
 			"sm_common: can't mark sector at %i as bad\n",