reduce scope of local variables

This eliminates some of the warnings from Cppcheck report of
2014-11-29.

Change-Id: Id5bf885de12a6de262d2cca9fa71627ac67f50d9
Reviewed-on: https://gerrit.libreoffice.org/13330
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>