Initialize a variable to avoid a warning when the compiler

(and/or the optimization level) may think it is used uninitialized.
The code was indeed correct, but unfortunately the result of
some compiler checks such as -Wunused and -Wuninitialized depends
heavily on the optimization level.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@75365 65c4cc65-6c06-0410-ace0-fbb531ad65f3