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 v4.19.195 by commit 4b380a7d84ef2ce3f4f5bec5d8706ed937ac6502, it was introduced in version v3.17 by commit 31434f496abb9f3410b10f541462fe58613dd3ad. For more details please see the references link.