reduce scope of local variables

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

Change-Id: Ic4bf3bd8f5982d2ea2f25a28c0dd61084c59af11
Reviewed-on: https://gerrit.libreoffice.org/13331
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>