coverity#1340226 Missing break in switch

Change-Id: Ibd1c15ce65501d4dc6d0cea8c8e5f4e683d1b7a4
(cherry picked from commit c5bfac3f)
Reviewed-on: https://gerrit.libreoffice.org/20177Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sd/source/ui/view/ViewShellBase.cxx

@@ -1255,6 +1255,7 @@ void ViewShellBase::Implementation::GetSlotState (SfxItemSet& rSet)
                         pFrameView = mrBase.GetMainViewShell()->GetFrameView();
                         bState = pFrameView->GetViewShEditMode() == EM_MASTERPAGE
                             && pFrameView->GetPageKind() == PK_STANDARD;
+                        break;
 
                     case SID_SLIDE_SORTER_MULTI_PANE_GUI:
                     case SID_SLIDE_SORTER_MODE: