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 v4.14.288 by commit 5269209f54dd8dfd15f9383f3a3a1fe8370764f8, it was introduced in version v3.8 by commit 877bd862f32b815d54ab5fc10a4fd903d7bf3012. For more details please see the references link.