Remove unused but set variables
Remove unused but set variables

This is needed to satisfy the new -Wunused-but-set-variable added in
GCC 4.6: http://gcc.gnu.org/gcc-4.6/changes.html

Fixes: https://bugs.freedesktop.org/37515

freedesktop-unofficial-mirror/telepathy__telepathy-idle,freedesktop-unofficial-mirror/telepathy__telepathy-idle,freedesktop-unofficial-mirror/telepathy__telepathy-idle