Such values are not supported by ff_subtitles_queue*

Fixes: signed integer overflow: 10 - -9223372036854775808 cannot be represented in type 'long'
Fixes: 24193/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5714901855895552

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