USB: failure in usblp's error path

if urb submission fails due to a transient error here eg. ENOMEM,
the driver is dead. This fixes it.
Signed-off-by: Oliver Neukum <oliver@neukum.name>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

drivers/usb/class/usblp.c

@@ -700,6 +700,7 @@ static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t
 		usblp->wcomplete = 0;
 		err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
 		if (err) {
+			usblp->wcomplete = 1;
 			if (err != -ENOMEM)
 				count = -EIO;
 			else