util/vhost-user-server: vu_message_read(): improve error handling

1. Drop extra error_report_err(NULL), it will just crash, if we get
here.

2. Get and report error of qemu_set_blocking(), instead of aborting.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
1 file changed