libxlDriverConfigNew() use libxlDriverConfigDispose() for cleanup in
case of errors. Do not call libxlLoggerFree() on not allocated logger
(NULL).
Signed-off-by: NMarek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: NJim Fehlig <jfehlig@suse.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>