USB: fix pm counter leak in usblp

if you fail in open() you must decrement the pm counter again.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Cc: stable <stable@kernel.org>
Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>

diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
index ad632f2..0647164 100644
--- a/drivers/usb/class/usblp.c
+++ b/drivers/usb/class/usblp.c
@@ -428,6 +428,7 @@
 	usblp->rcomplete = 0;
 
 	if (handle_bidir(usblp) < 0) {
+		usb_autopm_put_interface(intf);
 		usblp->used = 0;
 		file->private_data = NULL;
 		retval = -EIO;