usbnet: fix memory leak in error case
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.9.323 by commit 3eed421ca5c809da93456f69203d164d5220be3d, it was introduced in version v3.8 by commit 877bd862f32b815d54ab5fc10a4fd903d7bf3012. For more details please see the references link.