Fix memory leaks in stasis_channels and bridge_native_rtp
This patch fixes two memory leaks:
* A memory leak in packing channels into a multi-channel blob payload when
publishing dial messages. The multi-channel blob payload does not steal
the references - this approach was chosen because it works well with the
RAII_VAR macro. Unfortunately, this does mean that you actually have to use
the RAII_VAR macro (or manually deref it yourself)
* RTP instances returned as a result of one of the glue operations are ref
counted and have to be de-ref'd appropriately. We now do that, as saying
that we should do it and then not would be silly.
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@391479
65c4cc65-6c06-0410-ace0-
fbb531ad65f3