usb: printer double up()

[Pete Zaitcev <zaitcev@redhat.com>]

Doing a double up() is actually safe in Linux, but still, it's a bug.
This fix is present in 2.6.13-rc3.

By Domen Puncer <domen@coderock.org>
up(&usblp->sem) was called twice in a row in this code path.

--- linux-2.4.31/drivers/usb/printer.c	2004-08-10 13:43:36.000000000 -0700
+++ linux-2.4.31-usb/drivers/usb/printer.c	2005-06-05 11:21:12.000000000 -0700
@@ -740,6 +740,7 @@ static ssize_t usblp_read(struct file *f
 				schedule();
 			} else {
 				set_current_state(TASK_RUNNING);
+				down (&usblp->sem);
 				break;
 			}
 			down (&usblp->sem);
-
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