KVM: selftests: Add and use kvm_free_fd() to harden against fd goofs

Add a kvm_free_fd() macro to close and invalidate a file descriptor, and
use it through the core infrastructure to harden against goofs where a
selftest attempts to reuse a closed file descriptor.

Cc: Bibo Mao <maobibo@loongson.cn>
Cc: Fuad Tabba <tabba@google.com>
Cc: Ackerley Tng <ackerleytng@google.com>
Reviewed-by: Ackerley Tng <ackerleytng@google.com>
Link: https://patch.msgid.link/20260522171535.3525890-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

0 files changed, 0 insertions, 0 deletions