asix: fix uninit-value in asixmdioread()
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 v5.15.12 by commit d259f621c85949f30cc578cac813b82bb5169f56, it was introduced in version v4.9 by commit d9fe64e511144c1ee7d7555b4111f09dde9692ef. For more details please see the references link.