bridge_softmix: G.729 codec license held

bridge_softmix: G.729 codec license held

When more than one call using the same codec type enters into a softmix bridge
and no audio is present for a channel the bridge optimizes the out frame by
using the same one for all channels with the same codec type. Unfortunately,
when that number (channels with same codec type) dropped to <= 1 the codec
was not dereferenced. At least not until all parties left the bridge. Thus in
the case of G.729 the license was not released. This patch ensures that the
codec is dereferenced immediately when the optimization no longer applies.

ASTERISK-24797 #close
Reported by: Luke Hulsey
Review: https://reviewboard.asterisk.org/r/4429/

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@432174 65c4cc65-6c06-0410-ace0-fbb531ad65f3