UBI: remove redundant field

Remove redundant ubi->major field - we have it in ubi->cdev.dev
already.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index fe4da1e..9771e7f 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -61,7 +61,7 @@
 	int i;
 
 	for (i = 0; i < ubi_devices_cnt; i++)
-		if (ubi_devices[i] && ubi_devices[i]->major == major)
+		if (ubi_devices[i] && MAJOR(ubi_devices[i]->cdev.dev) == major)
 			return ubi_devices[i];
 	BUG();
 	return NULL;