9p/transfd: always use ONONBLOCK read/write
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 v5.4.225 by commit b1ad04da7fe4515e2ce2d5f2dcab3b5b6d45614b. For more details please see the references link.