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 v4.9.311 by commit e893ca9a5d1738a36d3a54c05d283fecd91fcd65, it was introduced in version v4.0 by commit a4f743a6bb201662962fa888e3f978583d61691e. For more details please see the references link.