CVE-2025-21666: NULL Pointer Dereference

In the Linux kernel, the following vulnerability has been resolved:

vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]

Recent reports have shown how we sometimes call vsock_*_has_data() when a vsock socket has been de-assigned from a transport (see attached links), but we shouldn't.

Previous commits should have solved the real problems, but we may have more in the future, so to avoid null-ptr-deref, we can return 0 (no space, no data available) but with a warning.

This way the code should continue to run in a nearly consistent state and have a warning that allows us to debug future problems.