avformat/lafdec: Check if all data was read

Fixes: OOM
Fixes: 54572/clusterfuzz-testcase-minimized-ffmpeg_dem_LAF_fuzzer-4974038870523904

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

libavformat/lafdec.c

@@ -21,6 +21,7 @@
 
 #include "libavutil/intreadwrite.h"
 #include "avformat.h"
+#include "avio_internal.h"
 #include "internal.h"
 
 #define MAX_STREAMS 4096
@@ -205,7 +206,7 @@ again:
         s->nb_stored = st_count;
         if (!st_count)
             return AVERROR_INVALIDDATA;
-        ret = avio_read(pb, s->data, st_count * st->codecpar->sample_rate * bpp);
+        ret = ffio_read_size(pb, s->data, st_count * st->codecpar->sample_rate * bpp);
         if (ret < 0)
             return ret;
     }