reduce scope of local variables

This addresses some cppcheck warnings.

Change-Id: I1122494e295af756ef3cc32717fe204505aeb9e3
Reviewed-on: https://gerrit.libreoffice.org/13335
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>