mtd: onenand: add mtd->writebufsize initialization

Initialize mtd->writebufsize to be equal to mtd->writesize.
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/onenand/onenand_base.c

@@ -4080,6 +4080,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	mtd->block_isbad = onenand_block_isbad;
 	mtd->block_markbad = onenand_block_markbad;
 	mtd->owner = THIS_MODULE;
+	mtd->writebufsize = mtd->writesize;
 
 	/* Unlock whole block */
 	this->unlock_all(mtd);