NFS: remove unneeded check in decodedevicenotifyargs()
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 v4.19.238 by commit 97cc035bdfe754dbfbc2c9b04bc46bc71ef5bc93, it was introduced in version v4.0 by commit a4f743a6bb201662962fa888e3f978583d61691e. For more details please see the references link.