static AVMutex without initialization (pthread_mutex_init)

[Antr]

ffmpeg version 4.0 built on Windows 10

{ libavformat/allformats.c }
static AVMutex avpriv_register_devices_mutex

{ libavutil/log.c}
static AVMutex mutex

{ libavcodec/utils.c }
static AVMutex codec_mutex

{ libavformat/utils.c}
static AVMutex avformat_mutex

[Hendrik]

All these AVMutex are initialized statically, ie.

static AVMutex mutex = AV_MUTEX_INITIALIZER;