[PATCH] USB: proper error return for usblcd

unknown ioctls return -ENOTTY and nothing else.

drivers/usb/misc/usblcd.c

@@ -98,7 +98,7 @@ ioctl_lcd(struct inode *inode, struct file *file, unsigned int cmd,
 			return -EFAULT;
 		break;
 	default:
-		return -ENOIOCTLCMD;
+		return -ENOTTY;
 		break;
 	}