UVI-2021-1001494 phy: mdio: fix memory leak

phy: mdio: fix memory leak 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 v4.4.289 by commit 25e9f88c7e3cc35f5e3d3db199660d28a15df639, it was...