can: gs_usb: gs_can_open(): prevent memory leak

BugLink: https://bugs.launchpad.net/bugs/1852335

commit fb5be6a7 upstream.

In gs_can_open() if usb_submit_urb() fails the allocated urb should be
released.

Fixes: d08e973a ("can: gs_usb: Added support for the GS_USB CAN devices")
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

drivers/net/can/usb/gs_usb.c

@@ -617,6 +617,7 @@ static int gs_can_open(struct net_device *netdev)
 					   rc);
 
 				usb_unanchor_urb(urb);
+				usb_free_urb(urb);
 				break;
 			}