We should only have to test a pointer once to see if it's NULL, after that
it can be safely derefrenced and its pointed-to value can be passed around by
reference.

Merge branch 'master' of git+ssh://git.sflphone.org/var/repos/sflphone/git/sflphone into audio_buffers

It was due to an insufficient number of parameters being passed to the ERROR
logging macro.

Merge branch 'fix_srtp' of git+ssh://git.sflphone.org/var/repos/sflphone/git/sflphone into audio_buffers