Bug#919206: please apply upstream fix from pull #11417

[Martin Pitt]

Control: tag -1 pending

Hello Rob,

Rob J. Epping [2019-02-07 16:12 +0100]:
> The patch in [1] is simple and solves the issue also in the current version.
> 
> [1] <https://github.com/systemd/systemd/pull/11417>

Cherry-picked, thanks!

Martin