veth: fix races around rq->rx_notify_masked
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 v4.19.230 by commit 8f0ea3777590c16222d4251a49e31dd376ff5ac1, it was introduced in version v4.19 by commit 948d4f214fde43743c57aae0c708bff44f6345f2. For more details please see the references link.