Fix memory leak with Dropbox version control plugin.

In the current version we only call endRetrieval when
beginRetrieval was successfully in UpdateItemStatesThread::run().
This causes some problems with version control plugins (like Dropbox plugin),
which have to do cleanups in endRetrieval.

Now we always call endRetrieval after beginRetrieval when updating the version states.

FIXED-IN: 4.13.1
REVIEW: 117753

src/views/versioncontrol/updateitemstatesthread.cpp

@@ -64,9 +64,9 @@ void UpdateItemStatesThread::run()
                     items[i].version = static_cast<KVersionControlPlugin2::ItemVersion>(state);
                 }
             }
-
-            m_plugin->endRetrieval();
         }
+
+        m_plugin->endRetrieval();
     }
 }