9p: set req refcount to zero to avoid uninitialized usage
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 v6.0.16 by commit 73c47b3123b351de2d3714a72a336c0f72f203af, it was introduced in version v4.20 by commit 728356dedeff8ef999cb436c71333ef4ac51a81c. For more details please see the references link.