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 v5.12.11 by commit 58ddf61f10b8f9b7b1341644bfee2f1c6508d4e1, it was introduced in version v3.17 by commit 31434f496abb9f3410b10f541462fe58613dd3ad. For more details please see the references link.