NFS: Fix a potential NULL dereference in nfsgetclient()
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 v4.4.273 by commit fab8bfdfb4aac9e4e8363666333adfdf21e89106, it was introduced in version v3.17 by commit 31434f496abb9f3410b10f541462fe58613dd3ad. For more details please see the references link.