print expected file name if it doesn't exists if
verbose mode is enabled*. It helps to avoid running
bios-tables-test under debugger to figure out missing
file name.

*)
verbose mode is enabled if "V" env. variable is set
Signed-off-by: NIgor Mammedov <imammedo@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: NMarcel Apfelbaum <marcel@redhat.com>
Reviewed-by: NMarcel Apfelbaum <marcel@redhat.com>