Fix a "set but not used" warning on newer gccs.

Turns out the "helpful" setting of ms and res in this
macro is completely useless after the timeout antipattern
fix.

If you're a new guy looking to write code, don't write
a macro like this one.
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Merged revisions 376087 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 376088 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 376089 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@376092 65c4cc65-6c06-0410-ace0-fbb531ad65f3