fixing syntax error - it it that hard to test own code?

caused by that commit https://github.com/owncloud/core/commit/18a2c48ceb2206fbc871dc0c28e5fb233b4fc0fc

And the pull request has been merged before the pull request analyzer finished
https://github.com/owncloud/core/pull/4745

Review and merge please
@karlitschek @Kondou-ger @bartv2 @bantu @butonic THX