avformat/rawdec: fix identifier names

Fixes: out of array access
Fixes: 22686/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5121369624018944

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/rawdec.c

@@ -123,6 +123,8 @@ const AVOption ff_rawvideo_options[] = {
     { "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
     { NULL },
 };
+#undef OFFSET
+#define OFFSET(x) offsetof(FFRawDemuxerContext, x)
 const AVOption ff_raw_options[] = {
     { "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
     { NULL },

libavformat/rawdec.h

@@ -95,7 +95,7 @@ static const AVClass name ## _demuxer_class = {\
 };
 
 #define FF_DEF_RAWSUB_DEMUXER(shortname, longname, probe, ext, id, flag)\
-FF_RAWVIDEO_DEMUXER_CLASS(shortname)\
+FF_RAWSUB_DEMUXER_CLASS(shortname)\
 AVInputFormat ff_ ## shortname ## _demuxer = {\
     .name           = #shortname,\
     .long_name      = NULL_IF_CONFIG_SMALL(longname),\