UBI: fix volume creation input checking

Do not use an unchecked variable UBI_IOCMKVOL ioctl.
Signed-off-by: NMika Westerberg <ext-mika.1.westerberg@nokia.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Cc: stable@vger.kernel.org

drivers/mtd/ubi/cdev.c

@@ -853,7 +853,6 @@ static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
 			break;
 		}
 
-		req.name[req.name_len] = '\0';
 		err = verify_mkvol_req(ubi, &req);
 		if (err)
 			break;