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 v5.15.86 by commit 1cabce56626a61f4f02452cba61ad4332a4b73f8, it was introduced in version v4.20 by commit 728356dedeff8ef999cb436c71333ef4ac51a81c. For more details please see the references link.