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 v5.4.126 by commit 0057ecef9f324007c0ba5fcca4ddd131178ce78b, it was introduced in version v3.17 by commit 31434f496abb9f3410b10f541462fe58613dd3ad. For more details please see the references link.