As signed linear audio data is accessed as 16-bit values, certain processors...

As signed linear audio data is accessed as 16-bit values, certain processors require the values to be aligned in memory.

(closes issue #16912)
 Reported by: michaelevdokimov


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@267862 65c4cc65-6c06-0410-ace0-fbb531ad65f3