vhost: Do not abort on log-stop error

vhost: Do not abort on log-stop error

Failing to stop logging in a vhost device is not exactly fatal.  We can
log such an error, but there is no need to abort the whole qemu process
because of it.

Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Message-Id: <20250724125928.61045-3-hreitz@redhat.com>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>