Don't use a buffer after it goes out of scope.

's' is set to 'workspace'.  Make sure 'workspace' doesn't go out of scope while
the reference to it via 's' is still used.
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Merged revisions 359056 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 359057 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@359058 65c4cc65-6c06-0410-ace0-fbb531ad65f3