Fix -Werror=unused-but-set-variable compiler error (gcc 4.6.2)

........

Merged revisions 352643 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 352651 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@352659 65c4cc65-6c06-0410-ace0-fbb531ad65f3