igb: Add lock to avoid data race
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 v4.19.256 by commit 2e8a30c1d994d91099fa8762f504b2ac9dce2cf7, it was introduced in version v4.3 by commit c23d92b80e0b44d4c17085f0413e7574a7583615. For more details please see the references link.