FreeSWITCH-FS-8767

Merge pull request #550 in FS/freeswitch from ~DRAGOS_OANCEA/freeswitch-dragos:opus-fec-fix to master

* commit '65fd07923eb3d53931616fcd701a809e71f4243b':
  FS-8319: mod_opus: fix and cleanup of switch_opus_has_fec() and switch_opus_info().