smb: do not double finish
Summary:
finish() must not be called twice yet previously the case branches
would call it but then there'd also be a global finished after the switch.
remove the cases' finished().
this code is, I think, actually not used anywhere so it matters little.
Test Plan: hoping for the best!
Reviewers: ngraham
Reviewed By: ngraham
Subscribers: kde-frameworks-devel, kfm-devel
Tags: Dolphin, Frameworks
Differential Revision: https://phabricator.kde.org/D28014