avformat/internal: Move FF_FMT_INIT_CLEANUP to demux.h

and rename it to FF_INFMT_INIT_CLEANUP. This flag is demuxer-only,
so this is the more appropriate place for it.
This does not preclude adding internal flags common to both
demuxer and muxer in the future.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/internal.h

@@ -39,12 +39,6 @@
 #    define hex_dump_debug(class, buf, size) do { if (0) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size); } while(0)
 #endif
 
-/**
- * For an FFInputFormat with this flag set read_close() needs to be called
- * by the caller upon read_header() failure.
- */
-#define FF_FMT_INIT_CLEANUP                             (1 << 0)
-
 typedef struct AVCodecTag {
     enum AVCodecID id;
     unsigned int tag;