mtd/ftl: don't cast away the type when calling add_mtd_blktrans_dev

Pass the actual mtd_blktrans_dev instead of casting the containing
structure to void *.

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

drivers/mtd/ftl.c

···
 
 		partition->mbd.tr = tr;
 		partition->mbd.devnum = -1;
-		if (!add_mtd_blktrans_dev((void *)partition))
+		if (!add_mtd_blktrans_dev(&partition->mbd))
 			return;
 	}