Suppress compiler warning.

This code caused a compiler warning when --enable-dev-mode was not used.
The warning was that this variable was set but not used.  That was indeed
the case as the only place this is used is as an argument to SKINNY_DEBUG
which is compiled out when not in dev mode.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@383838 65c4cc65-6c06-0410-ace0-fbb531ad65f3