CVE-2025-38726 net: ftgmac100: fix potential NULL pointer access in ftgmac100_phy_disconnect

In the Linux kernel, the following vulnerability has been resolved: net: ftgmac100: fix potential NULL pointer access in ftgmac100phydisconnect After the call to phydisconnect netdev-phydev is reset to NULL. So fixedphyunregister would be called with a NULL pointer as argument. Therefore cache th...