coverity#736084 Missing break in switch

Change-Id: I3c7a032441402455d0a6ed28fc2cd5ce958ead04
(cherry picked from commit 5c291a0287af46558d3ef96d18b114c371ddd31b)
Reviewed-on: https://gerrit.libreoffice.org/8691
Reviewed-by: Matúš Kukan <matus.kukan@collabora.com>
Tested-by: Matúš Kukan <matus.kukan@collabora.com>