xen/netfront: react properly to failing gnttabendforeignaccessref()
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 v5.4.184 by commit 0e35f3ab69bcb01fdbf5aadc78f1731778963b1c. For more details please see the references link.