net: lan78xx: fix transfer-buffer memory leak

The interrupt URB transfer-buffer was never freed on disconnect or after
probe errors.

Fixes: 55d7de9 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Cc: [email protected] <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: jhovold

drivers/net/usb/lan78xx.c

@@ -3788,6 +3788,7 @@ static int lan78xx_probe(struct usb_interface *intf,
 			usb_fill_int_urb(dev->urb_intr, dev->udev,
 					 dev->pipe_intr, buf, maxp,
 					 intr_complete, dev, period);
+			dev->urb_intr->transfer_flags |= URB_FREE_BUFFER;
 		}
 	}