Use the proper lower bound when doing saturation arithmetic.
16 bit signed integers have a range of [-32768, 32768). The existing code
was using the interval (-32768, 32768) instead. This patch fixes that.
Review: https://reviewboard.asterisk.org/r/2479/
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Merged revisions 386929 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 386930 from http://svn.asterisk.org/svn/asterisk/branches/11
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@386931
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