coverity#1078626 Missing break in switch

Change-Id: I4b9b846049d9802a319b403e1f45734b7bd604f2
(cherry picked from commit 4e3e1420af51f7776dceb6b2800b761e57ddfe63)
Reviewed-on: https://gerrit.libreoffice.org/9529
Tested-by: Kohei Yoshida <libreoffice@kohei.us>
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>