...instead of converting from sal_Int32 to double and back to sal_Int32

Change-Id: I005777ff031dbbd919d46c971a84dff17f0adf9b
Reviewed-on: https://gerrit.libreoffice.org/47997Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>