Make mtdblock_ro unconditionally readonly

mtdblock_ro is by definition readonly.  Remove the silly checks.
Signed-off-by: NJörn Engel <joern@wohnheim.fh-wedel.de>
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>

drivers/mtd/mtdblock_ro.c

@@ -45,9 +45,7 @@ static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
 	dev->blksize = 512;
 	dev->size = mtd->size >> 9;
 	dev->tr = tr;
-	if ((mtd->flags & (MTD_CLEAR_BITS|MTD_SET_BITS|MTD_WRITEABLE)) !=
-	    (MTD_CLEAR_BITS|MTD_SET_BITS|MTD_WRITEABLE))
-		dev->readonly = 1;
+	dev->readonly = 1;
 
 	add_mtd_blktrans_dev(dev);
 }