Merge "json: Audit ast_json_* usage for thread safety."

main/aoc.c

main/loader.c

main/rtp_engine.c

main/stasis.c

main/stasis_channels.c

res/res_fax.c

res/res_stasis.c

res/res_stasis_playback.c

res/res_stasis_recording.c

res/stasis/app.c