cifs: fix double free race when mount fails in cifsgetroot()
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 v5.16.13 by commit 563431c1f3c8f2230e4a9c445fa23758742bc4f0. For more details please see the references link.