misc: clean some build warnings

src/account.cpp

src/jamidht/account_manager.cpp

src/jamidht/channeled_transport.cpp

src/jamidht/jamiaccount.cpp

src/jamidht/server_account_manager.cpp

src/media/audio/alsa/alsalayer.cpp

src/media/audio/audio_input.cpp

src/media/audio/audiolayer.cpp

src/media/audio/jack/jacklayer.cpp

src/media/audio/pulseaudio/pulselayer.cpp

src/media/congestion_control.cpp

src/media/media_decoder.cpp

src/media/media_player.cpp

src/media/socket_pair.cpp

src/media/video/video_input.cpp

src/upnp/upnp_control.cpp